Too early to ask.
Does it actually go to 7fps in crop mode as some claim?
Will it deliver Exmor or better DR?
It sounds like it will deliver all of that, but I'm still a bit worried it might be stuck at 5fps even in crop mode or that maybe the 5fps is the crop mode speed and FF speed is even slower. And maybe it's wishful thinking to believe the Sony sensor or Sony fab producing a radical new Canon design.
(Sadly, it seems like all signs are pointing to rather poor video, but there is still a chance it might have zebras,focusing aids,10bits,4:2:2 or 4:4:4 although the hints make it sound all very unlikely, which is really a shame, since between no 4k and none of that it will mean giving away a 5D3 that actually, with ML, will likely deliver much better video quality (if willing to mess with RAW video) and with much better video usability than this new camera.)
For me it's simply got to have the Exmor or better DR since it won't give top quality 4k video.
And since the video will probably be even worse than what I can get out of my 5D3 and tougher to use, I'd say it's also gotta give me the 7fps in the crop mode and arrive at a decent price.
Between the 5fps FF, 7fps cropped, the 50MP, the Exmor DR, the likely 5D3 or better AF, it would at least deliver pretty much all I could ask for as far as still as this point in time.
If the price is too crazy though then you are left with truly no money (well I would be at least hah) to get video from some other brand or even to afford the 5Ds to begin with regardless).
If doesn't do all that, then considering the likely poor video, forget it.
If it delivers the 50MP, 7fps cropped mode, Exmor or better DR and overall excellent sensor performance, AF at least as good as in the 5D3 and the price isn't more than what the Euro pricing rumor hints going by direct $ exchange then I think I'd be pretty interested. It would be exceedingly dissapointing regarding video, but basically deliver on every last thing I could ask for in a still cam at this point in time, which would be a pretty refreshing and exciting change from Canon (ignoring the sad video aspect) and rather enticing to say the least.
If it is a 7D2 sensor made FF size, max 5fps and poor video, I won't even know what to say other than I guess it would be a clear sign that it's time to just give up on Canon and maybe make the full switch to Nikon and not even bother using a hybrid Canon plus Sony+adapter system.