No way, this many years later and a few extra MP (considering the 70D density really is pretty high already) anda couple extra fps? I don't see that at all, they will get their goose cooked. It's gotta add 5D3-type AF and other stuff to the mix. Don't forget this body will also expected to see for like 2-4 more years!
Don't underestimate Canon's ability and willingness to handicap cameras. 24 MP with Dual Pixel CMOS AF (so they can later pass the 20 MP version to the Rebel/xxxD line and the M, then the 24 MP to the 80D), better AF but not 5DIII/1D X (say 31 AF points, each column on the 7D AF with an extra top/bottom point, but no more columns). Spot and Zone AF (yes, Virginia, they really left those out of the 70D so, like Santa Claus, they could give them back with the 7DII). Extras like direct RF control of the -RT Speedlites (a cool, hype-able new feature that oh-by-the-way would boost Speedlite sales). Just sayin'...
Indeed, Canon has a history where it's handicapped cameras, particularly via firmware limitations, and/or some improvements that could have been incorporated (at not too much cost). Some examples spring to mind: 400D, 30D, 60D, etc.
The 7D came out and I thought Canon were being 'generous' with the feature list - and I still think they were. I love my 7D - though I'm aware there could have been some improvements made.... but I chose it early - and haven't looked back.
I do wonder if the 'groundbreaking' rumours we started hearing some time ago that would be in the 7DmkII is actually the dual pixel AF of the 70D? (ie if 'the rumour spreaders' had the Canon body model name / number wrong?)
The 70D's ISO ability looks close, and probably a bit superior to Canon's previous APS-C 18MP sensors. But it's not 'ground-breakingly' better. I would be surprised if there is a significantly better new sensor (still APS-C) in the 7DmkII (which I believe is already close to final production). I do expect the 7DmkII to maybe have a different sensor to the 70D. If it does, I hope it's somewhat better on ISO than the 7D. (I don't need more than 18MP btw).
I believe the main features separating the 7DmkII - from both the 7D and 70D - will include:
- feature set, such as GPS, wireless, remote flash control
- FPS (eg 10?)
- build quality & shutter durability
- improved optical AF (as the 70D has the 7D's AF, the 7DmkII will have improvements in that space)
- an articulated screen (the 7D's is 'fixed')
- probably improved LiveView AF too.... ie even faster, better implemented dual pixel AF than the 70D has
Looking forward to what the 7DmkII will be. I must say I'm impressed with what Canon has done with the 70D, and I will probably go to a store and try one (instore) out of curiousity!