I cannot see the 7D going FF. Forget what was said about naming problems that come from continuity of sensor size or annoying legions of 7D and EF-S owners looking for an upgrade path (which are both real concerns) but think about what a FF 7DII that retains the ethos of the 7D with good AF/fast FPS. You end up with the 5DIII but trading a worse AF (but still very good) for better FPS. How could they release this without killing the 5D line dead? It is just too similar.
If it were me, this is how I'd pitch the Canon line-up (coming from pure speculation based on nothing more then what I think makes sense).
1Dx - Top of the line Pro camera @ $6800
5DIII - High-end small form factor FF @ $3500
7DII - High-end small form factor APS-C @ $2200 (61pt AF/8-10FPS)
9D - Entry level FF @ $1600 (Build like a rebel or xxD, not highly sealed, low FPS, xxD or 7D AF)
70D - Enthusiast APS-C @ $1200 (7D AF/6FPS)
650D - Everyman's DSLR APS-C @ $850
1100D - Low-level budget APS-C @ $500
The only thing I am unsure of is where I'd place the high MP camera. Do you go 3D level @ $5000 and go for really impressive and hope that everyone who gets upset about price already got offended by the 5DIII price and jumped ship to the D800? Or do you place it competitive to the D800 at around $3000 and risk over crowding the 5DIII/7DII (and if this is the case, what will Canon leave out to make it fit the price slot)? Finally, if it does compete with the D800 price wise then what will move into the mysterious $5000 price range unless Canon goes for 2 high MP cameras?