I'm afraid it will have a lot of more or less useful features but not much better IQ.
We should expect 2 digics, android & ios support, gps, radio remote flash, touchscreen, built-in flash, 3-6 MP more and 1/4 - 1/2 stop better ISO performance with the same DR. AF better than 5d3, maybe even better than 1dx. It could also be strong in video as 1dx. Looking at similarities between 1dx and 1dc, maybe this time the "C" brother of this new 7d2 could be some high fps video camera (1920p @60, 720p @120)?
Priced at 2499$-2999$ depending on video features.