The Jack of all trades!, a great evolution
-New sensor ( I hope for the forums that it measures well

, personally i mostly care for iso perf. )
-Finally a Good(great) raw buffer! ( thank you canon for not pushing me towards nikon..., shame on you for not having foresight to give the 7dII 70raw)
-Improved (supposedly even better) AF performance/tracking (The f8 ability also looks compelling!)
-4k video(at 60fps) for those who need video! (For those who shoot a lot of video I hope canon will give 4k 30 as a firmware update for the 7dII)
-14 FPS is quite the achievement !
-(free)*** is a nice addition!
Decent(good) introduction price...
Fingers crossed that they can improve at least 1 stop over the 1dx

The specs look good, but to really be a significant upgrade over the 1dx I think the sensor needs to be improved quite a bit.... , But I think the 1dx owners can elaborate on what will make them want to upgrade?!
Personally I will wait for some reviews and possible ''early release issues'' ( but that goes for any tech product).
But this looks like 'the perfect' wildlife camera for me , Something I have been waiting on since the 1mkiv...