New body spotted at IAAF Daegu?

[Akkku]

Doesn't look like a 5D MkII to me... Prism looks squarer.
The photog in picture is Kai Pfaffenbach for Reuters. He's also noted Canon photog so why tape the model?

I'm Nikon shooter, so I maybe wrong with this

[neuroanatomist]

Doesn't look like a 5D MkII to me... Prism looks squarer.

True - it looks like a gripped 5D (classic/MkI), which has a squarer, sharper bulge for the pentaprism (5D on the left and middle, 5DII on the right):

 

He's also noted Canon photog so why tape the model?

Pros often tape the model on their cameras.  In this case, would a 'noted photog' want everyone knowing he was using the 'outdated' 5D instead of the newer 5DII?   

[Eagle Eye]

Guys, that's definitely the rumored EOS 3d.  Look at the black body, the hot shoe, and neckstrap attachment points; definitely, definitely a 3d.

[JonB1975]

I've just compared this image with several other images of the 5D mkII - and that's what it is - a mkII...
Of more interest is the fisheye zoom!

[w349]

If it were a 5D classic, then what is he looking at? Live View on a Mark II, presumably?

[neuroanatomist]

I've just compared this image with several other images of the 5D mkII - and that's what it is - a mkII...
Of more interest is the fisheye zoom!

I think the OP is right - the angle on the top-front of the pentaprism housing is not rounded enough for it to be a 5DII.  Also, though it's tough to tell with the small image, the knurling on the mode dial looks like the vertical lines of the 5D, vs. the little squares of the 5DII.

Why, exactly, is the fisheye zoom interesting?   

If it were a 5D classic, then what is he looking at? Live View on a Mark II, presumably?

The review image on the LCD.  Before Live View, to shoot in a situation where you couldn't look through the VF (and didn't have the Angle Finder C or equivalent), you'd aim, shoot, review, adjust, shoot, review, etc. - tedious, but effective.

[DavidRiesenberg]

The side surfaces are all wrong for it to be a 5D. On the 5d they are much smoother, while here you can clearly see sharper corners. The evolution of the edges around the mirror housing are reversed as well.

[match14]

It's very similar to a Mark II.

[neuroanatomist]

The side surfaces are all wrong for it to be a 5D. On the 5d they are much smoother, while here you can clearly see sharper corners. The evolution of the edges around the mirror housing are reversed as well.

Hmmm...I see your point.  There's a vertical 'line' (sharper angle) at the base of the lens mount, whereas the 5D has a shallower curve there.  I conceed - the angle of camera accentuates the pentaprism housing, but it does seem more like a 5DII based on the curves/lines on the body.  Also, the textured area between the strap lug and the rubber port covers seems a little short to be the 5D - that area is shorter on the 5DII because the port covers are longer to accomodate the additional ports (HDMI and Mic).

[Gothmoth]

looks like a 5d mk2 too me.

http://farm4.static.flickr.com/3576/3360464338_a6d1bc1688.jpg

[iaind]

Grip not dissimilar to BGE-6 so probably 5DII. 

[DJL329]

The highlights and shadows by the prism are playing tricks on us.  It's definitely the 5D Mark II.

[dr croubie]

Of course, if you're going to send prototypes out into the wild, wouldn't you put a new sensor and motherboard into an old-design case so noone recognises it?

I know i've done that in my electronics prototype work, old case + new boards + dremel does fine for testing until the new case is machined

[Cropper]

Why should it be so hard to believe that this is actually a 5D III prototype ?
Why should we go to such lenghts to debunk it ?

It's safe to say that by now there should be many such prototypes around in the hands of key photographers, and Kai could very well be one of them.
He definitely seems to have a strong affiliation with Canon.
( http://cpn.canon-europe.com/content/interviews/pfaffenbach.do )

Regarding the upcoming Olympics, the IAAF Championchips seems like a more than an adequate place to try out the new camera bodies.

I fail to see any other plausible justification for covering the logos on the camera, especially since Kai is a Canon endorsee.

The similarities of this body with the 5D II are evident, but we actually don't know how the Mark III will look like. It could be very similar. Also as it has already been mentioned, what's on the inside is what really matters.

I sense a future Mark III here...

[ecka]

I fail to see any other plausible justification for covering the logos on the camera, especially since Kai is a Canon endorsee.

IMHO, the only meaningful justification for covering the logos is that he (and many others professionals) do not want to advertise any brand for free. If Canon was giving me a free 5D2 on one condition that I must be wearing an advertising T-shirt all the time I use the camera, I would accept the deal. But I'm not a professional or famous or something. I don't have to advertise my own brand (name) and Canon would never offer me such a deal because nobody really cares what brand gear I'm using.