A few people are reporting seeing some sort of dust or debris sandwiched in the filter stack that covers the sensor. Seems like it was probably a manufacturing defect such as dust in the air in the assembly room.  Not all cameras are affected. but some certainly are. The effect on the image is small, but it can certainly be seen, especially when shooting at small apertures.

I'd expect Canon to offer a free fix for any camera showing this problem sometime in the very near future. Either a sensor unit replacement or a cover filter replacement if it's not bonded to the sensor itself (it is in some cameras).

This just in from LensRentals:
http://www.lensrentals.com/blog/2015/04/canon-t6-sensor-issue

Hi!
I am trying to get a uwa lens like 16-35 or 17-40 mm for my Canon EOS 6D. I would like to keep the cost down so I will forego IS and will not insist on a constant aperture lens (f/4 or F/2,8) and I am willing to consider third party manufacturers as well. I would like to know what choices are available in the market and at what price ?  Color fringing and vignetting , especially at the wide end is, of course, to be minimum and auto focus must work well in different light conditions. I believe some new lenses have come recently in the market.

Thanks and regards

Well, at $2400 it's a VERY expensive 1" sensor fixed lens still camera. To me it looks like something designed primarily as a 4K HD video but that can also shoot decent stills.

A few years ago Canon showed a mock-up of their "camera of the future". It was a still/video camera with such high resolution and so many pixels that the image could be cropped to mimic the effect of a telephoto lens without quality loss. It was their "vision of the future" but they had no date attached. Probably around 2030 or so.

In 2010 they showed a concept camera which they described as a"Multi-purpose camera - a compact and lightweight camera which supports both video and still image capture with ultra-high definition 4K resolution.  Suitable for both work and professional use it features a newly developed CMOS sensor that enables video shooting at high frame rates in excess of 60 frames per second". That sounds a lot like the XC-10.

I strongly suspect that we will be seeing 4K video on the next generation of what we think of as still DSLRs too (5D MkIV maybe?). I wouldn't be surprised to also see it on digital rebels at some point. It's just a matter of software and processing speed. APS-C sensor have more than enough pixels for 4K video.

The EOS 1D C is the real 4K video plus stills camera, but it's $8000.

Note that there are other similar cameras around. For example the  Sony FDR-AX100/B (http://www.adorama.com/Refby.tpl?refby=rflAID012417&sku=SOFDRAX100B) is $1700, has a 1" Sony Exmor sensor and shoots 4K video and 20MP stills.

Interestingly, Canon bills the New XC-10 as a true Hybrid Video and STILLS Camera
It almost seems as though Canon is answering the 'mirrorless' question from a completely different angle than anyone else.
It seems as though it would be very well suited for many 'workhorse' professional tasks. 12mp stills are certainly good enough for many news , reportage, sports, event etc with the ability to shoot very high quality video in a small package at a reported reasonable price.
Clearly not aimed at the highest end of any of it's functions, but aimed to be more than good enough for an awful lot, I think it's interesting.
Clearly, it remains to be seen if it is fast enough and sharp enough and tough enough to stand up to 'Professional requirements', but IF that proves to be true, Canon may have done a really smart thing.

On the other side, it doesn't seem to be a camera anyone was asking for, it's got a fixed lens, it's Only got a1" sensor, with Only 12mp. It's got an EVF.
These are all things which could cause it to be less than successful,-----All things that traditional DSLR shooters have not embraced.  I'm one of those. But even though I don't personally want one, I can't help but wonder 'Have we seen the future'  or another EOS M.   It feels like more than an M to me.
Could it be one of those "I didn't know I needed it until I saw it" things , or is it far enough off the mark to be a flop??

So what do You think ??
Michael

mjperini: "Why Canon would want to exclude purchasers of some of their most expensive cameras for helpful free software continues to elude me.??"

Frank: "Because they want you to buy new ones! Just like they refused to do the obviously demonstrated optical correction on my EF600/4LIS (I)."

We're now up to v 4.2 with what look like many helpful features.
Still no support for the 1Ds III  1D III or earlier 1 series cameras, but ever growing support for consumer cameras.
This is more than a little frustrating for those who have older top of the line cameras, especially since the 1DsIII is Still the last 's' version of the 1 series.
Why Canon would want to exclude purchasers of some of their most expensive cameras for helpful free software continues to elude me.??

Here is the list of supported cameras:
Digital Photo Professional 4.2.10 supports EOS 8000D / EOS REBEL T6s / EOS 760D, EOS Kiss X8i / EOS REBEL T6i / EOS 750D, EOS-1D C, EOS-1D X, EOS-1D Mark IV, EOS 5D Mark III, EOS 6D, EOS 7D Mark II, EOS 70D, EOS 7D, EOS 5D Mark II, EOS Kiss X7i / EOS REBEL T5i / EOS 700D, EOS Kiss X7 / EOS REBEL SL1 / EOS 100D, EOS M3 and is a genuine, Canon-made application for browsing, selecting, and developing RAW images. It has various image adjustment functions in the Picture Style format and allows the user to make speedy image adjustments with freedom.
 

The EF 24-70/4L IS USM is a very nice lens. Probably a little better then the EF 24-105/4L IS USM and about $300 cheaper right now. It's pretty good for macro work, with a 0.7x maximum magnification and the hybrid IS system. It won't be as sharp as a true macro lens, but it will be sharp enough for most people and sharper than most "close focusing" lenses. The only drawback I see is that it's not very wide on APS-C. The 24mm becomes an effective 38mm (in full frame terms) once the crop factor is taken into consideration.

Note that at 0.7x, the front element of the lens is only about 1.2" from the subject (see review below). This may or may not be a problem, depending on what you are shooting and how you are lighting it. A true 100mm macro lens might give you up to 6"

24-70 is probably a good range for video use. The USM motor is good - and the best/fastest for shooting stills - but STM motors will give smoother focus adjustment for video and are quieter because the STM motors focus continuously while the USM motors tend to focus in steps and so make a "clicking" noise on the video soundtrack. USM motors are made to focus from point A to point B in as short a time as possible. STM motors are also quick, but their focus speed can be slowed down and so avoid fast focus "jumps" when shooting video.

I reviewed the 24-70/4L and compared it with the 24-105/4L (for still photographs) here - http://www.bobatkins.com/photography/reviews/canon_ef_24-70_f4_is_review.html

Would a 24-70L f/4 be good for video? 

With a $200 rebate, 4 stop hybrid IS, and macro capability, it looks like it would be worth the extra money for the lens that would be on the camera 90% of the time and save me from spending $$$ on a macro later

No, no special codes. I get credit if use the link. Thanks.

The superzooms like the 18-270 are certainly very convenient, but can't compete with lenses like the 70-300, especially at the longer focal lengths and at the edges of the image. Also, the 18-135 (and the 40/2,8) is an STM lens, which is better for focus  tracking when shooting video.

To save some money you might also look at the EF-S 18-55 STM lens. Even though it's a "kit" lens it's quite good for the $149 price. Maybe not quite as good as the 18-135 and with reduced focal length range, but it's $400 cheaper. Combined with the 70-300 it would give you a lot of focal length coverage. It's  unlikely you'll miss the 56-69mm focal length range (just substitute one step closer of further away for nearby subjects). The only issue is you might have to swap lenses more often than with an 18-135.

If you shoot video with the 70D, an STM lens will be something very nice to have. AF focusing and tracking is very smooth with STM lenses.