I´d like to know why Canon is announcing the cams so late....
Canon has been burnt by the 1dx & 24-70ii delays, now they'll release it if it's really ready for production.
Shutter lifecycle is irrelevant. Almost nobody ever wears out a shutter on any DSLR, let alone a consumer model,
Not so: Shooting brackets (3+ shutter cycles per shot), focus stacking (10-20+ cycles) and using live view with quick af (one cycle very af action) I'm now on 125k cycles on my 60d after about two years.
Dual memory card slots are irrelevant to all but a very small minority of shooters, too...essentially, the only ones who care are those who need a redundant backup, and they're all shooting with two bodies anyway.
That doesn't make sense: Another body doesn't protect you from card failure, i.e. coming home and the data isn't readable but the camera thought it was written just fine. For many, no dual cards disqualifies a 70d or 6d as a backup body for a "pro" first camera 7d2/5d3 - probably what Canon intends.
If they want to pull some Rebel/Kiss/xxxD users upmarket they really need to up the AF.
Canon might decide last minute based on market research what existing af system to chuck in - 60d or 7d. But I'm not very hopeful, there are plenty of other tech specs above the rebels and the whole usability, Canon might think that'd be enough or they'd risk 6d upselling.