I didn't say "successor", just "full-frame version".Canon already released a full-frame 7D. It's called the 5D Mark III.
No, it's called 1dx if you want to leave the price tag out of the equation since it's got 18mp and fast fps like the 7d. Or, if you really see the 5d3 as the 7d successor, Canon is even beyond their "double the price" policy this time.
And no, I don't see the 1D-X having anything to do with either of them, since it's a completely different beast alltogether.
As for the 7D2, I think it will be an evolutionary upgrade (bringing some of the 5D3's features the original 7D didn't have back to the line) and, of course, will still be a high-framerate APS-C camera.