I think the tests from the canon site are not a reliable tests, they look pretty good, but if the improvement is not good enough I think they would try to hide that fact, it would not be smart from them to give us reasons to start judging a camera that has not even made it yet to the market.
After taking pictures with my MKIII i went back to my 60d, I felt comfortable enough, obviously I missed the MKIII autofocus system and the high iso performance, so if the 70d has a little improvement on these areas I will happily use an APSC camera more often, specially with the release of the 18-35 1.8 (sharp) and covers my wide range pretty good, paired with my 50 1.4 on crop I think with this two lenses I will be able to achieve pretty good results on most of my stills and video projects (wedding pictures and videos).
Do you think that the dual pixel cmos will improve the AF system enough? will it be slightly slower than MKIII´s AF system?
And the AF system on video mode looks cool, you could avoid using a follow focus some times, but I think that in the end we will use the manual focus more than we think, all of my lenses are not STM so...