I'm sure the new 7D II will be awesome but the EOS landscape has changed a lot now that we have the 6D selling at a similar cost to the 7D's introductory price and I wonder what effect that will have on the next model. Will it be a rugged 70D with higher FPS? An APS-C 1D X Jr.? Something else?
The slot is there ready for the new 7D now. IMO it will offer top end controls (now restricted to 1, 5 & 7D models) at a price equal to, or very slightly below the 6D but still twice as expensive as the current 70D, and for that extra money over the 70D you'll get 'high end' controls, slightly faster in speed and AF, and I think it will lose the pop up flash.
But also a different sensor which will eventually filter down the models until it's in the 1800D in five years time. And I guess that's what's holding it up. If dual pixel had been enough of a step forward I think we'd have seen it in a 7DII before filtering down to the xxD line.
Where's the real world weakness of aps against FF ? I find it's the high ISO Performance. From a marketing point of view FF can probably stand on its larger size benefit so Canon could afford to improve aps low light performance without taking too much away from potential new FF sales. How about an aps-c sensor with larger pixels, using the latest tech but still keep a resolution of around 14 to 16 mp.