My take on "What EOS Will Look Like by Photokina":
Overall I don't think we'll see many surprises, mainly incremental updates except for the 1Ds.
I'd love to see Canon playing with some new concepts (hybrid viewfinder anyone?) but Canon seems to be pretty conservative in that regard.
I think a fast FF camera is overdue and I also think that APS-H is on it's way out. I've said this before and I know that some people think differently about the topic, but Nikon upped the game with the D3 and it's Canons turn to catch up - but now they'll have to compete with the upcoming D4. Also, we can expect Canon's new processor to be fast enough to allow for high speed and high resolution at the same time.
To please the current APS-H shooters, I could imagine Canon offering an APS-H crop-mode, probably in combination with an LCD viewfinder overlay (they could show the outline or even completely black out the unused parts of the frame). I also think that they'll continue to sell the 1D4 as long as there's demand for it.
There will be a 5DIII.
If there will be a cheaper FF camera, I'm pretty sure it will be the 5DIII and not a 6D or something like that. I'm still of the opinion that the 5D series is Canon's "cheap FF" series. What would you do to make the 5D2 cheaper? Plastic body? Penta mirror VF? Worse AF? Slower FPS? Not really. Feature-wise the 5D2 already plays in the same league as the XXD series (before the 60D), so the next step would be to make it the "FF rebel". I don't think we want Canon to go there.
Anyway, I think the most likely scenario is that the 5DIII is simply an evolutionary upgrade to the 5DII. Better AF, new sensor, new processor, a lot of new software features. I don't expect any surprise moves from Canon.
7D Mark II
Might get launched at Photokina 2012 but not before that.
No idea, really. We'll probably either see this or the 7D2 at Photokina (with the other camera being released in 2013).
Will probably be released as a minor update to the 600D in early 2012. It will probably just switch to Digic 5 and add a few minor features like video AF (similar to Nikon). In the entry-level camera class this has become almost like fashion. Every manufacturer needs something new each year, so consumers don't think they're buying "old tech".