But I wouldn't be surprised if the 7D2 will have a 16-18 MP sensor. To be honest, I would even prefer a 16 MP 7D2 over a higher res one if this means better high ISO IQ, not to mention speed. After all, the 1Dx and the Nikon D4 are 18 and 16 MP, respectively, and none of their owners complain about this despite being both FF cameras, since both are geared for speed and highest IQ and those are the reasons for purchasing them, apart from build quality.
My thoughts exactly!
The 7D series is positioned as a sports body. So no 24mp sensor on the 7DII, that's for sure.
Lowering the resolution to 16mp might be too bold and controversial, so Canon might stick to 18mp after all.
Overall, though, Canon will most likely work to make the 7DII ISO better - and that, of course, rules out resolution increases.
For more resolution (plus good ISO), Canon offers FF cameras.