I'll not be surprised if 70D and 7D2 will sport the same 18MP sensor... Maybe some other features will be improved but if they're not going to upgrade their sensor technology, I'm still expecting the old 18MP sensor. Anyway, I just hope they can drive 6D's price down a little bit more.
If they had a new sensor ready i'm sure they would have told us. If they had it ready by now, they'd release either the 70D, 7D2 or both. They didn't which means they don't have the sensor ready. Now they can postpone it but they need to release something. So they wait a bit and then release a camera with the old sensor and some gimmics like WiFi, touch-screen or slightly better framerate and AF. 70D gets single card no sealing, 7D2 dual card slots and sealing. Then we wait for the new sensor to arrive in about 2015..16..17.