Note the date on the linked rumour - it's from over a year ago! Far before the 6D existed, and you could say the current 6D fits in where they describe the 7D mk2.
I've asked before, and I'll ask again - has there been any precedent for Canon to change sensor size within a model series? I can't see any successor to the 7D name being anything other than APS-C. If they change the sensor, they change the name too. On the "1D style body" noises, same question. Have they ever done radical changes in body size/shape within a series? Ok, the 60D may be slimmed down a little from the 50D and earlier, but that's in another direction.
To me, I find it hard to believe whatever will be called a 7D mk2 to be anything other than a normal body (non 1D style) with APS-C sensor. If they do make something that different, it will be called something else and not be a 7D any more! Have the mythical 3D for example.