Someone has to be first.... when the new technology is ready the will start to use it in ALL new releases. And besides, follow the money.... the lower down you go in the camera line, the greater the sales. Canon makes much more money off of the Rebels than the pro cameras... from a financial perspective it may be more important to upgrade them first.... Also, for fabrication reasons, I can see the smaller sensors being manufactured first.If Canon doesn't release a 70D or 7D2 that are really outstanding with close (but not as good) ISO performance as the 6D, 5D3 & 1DX and updated sensors i'll just have to invest into a 17-40L and 6D or move to the dark side.
You're really expecting the 70D, or even 7D2 for that matter, to have close to the same ISO performance as the latest model FF cameras?
He may be closer to the mark than you think...
Perhaps not the 70D...but I fully expect future 7D2 to rival high ISO of not just 5D3, may be even the 1DX... it will jive well with the intended use of a cropped high speed camera. The price will probably reflect that.
So you think that Canon just released 3 new FF cameras using older sensor technology, saving the latest and greatest for a crop sensor to release a year later? Presuming it has the latest in AF to match its predecessor, don't you think that would steer a lot of the potential market away from the more expensive FF lines?
And with the pressures facing p/s cameras from the cell phone crowd, I can see the EOS-B being FAR more important to Canon than any of the pro or enthusiast models.