A number of us posted on a thread some time ago (a few months?) - about the time from R&D on new technology and putting into a new DSLR, and the time between initial announcement, to production and final release.
The most knowledgable people (including some CR contributors who work in electronics / R&D) - said that the process would usually take some years with 'new technology', into something like an DSLR.
So, I believe Canon could have a new sensor in the 7DmkII - as well as 1 or 2 other 'great features' (eg improved AF, eg more pts and dual focus LiveView & improved optical focus).
Hoping for such a camera, sometime in 2014!
I guess you're right Paul. In terms of marketing this new body has to be really well positionned ; well above the new 70d in terms of specs and price but it can't be in competition with the 5DIII even if it's a FF body (6D is not the problem, this body isn't for wildlife or sport shooting, the 5DIII can easily do it).
So i see its specs and price between those two bodies with high fps (8 to 10), great AF, high iso capabilities but not as good as the 5DIII (FF can't be matched by crop body for now), a weather sealed body and a better version of the sensor of the 70D... I don't see the Wifi in (it would be an upgrade compared to the 5DIII).