"I might never make sense again! I might have two heads, or no head. Imagine me with no head, ha! And don't say that's an improvement...But it's a bit dodgy, this process. You never know what you're going to end up with." Regeneration is a tricky process.
Aaaahhhhhhh that sounds cool! And a relief! I don't keep up with the DW news so I'm glad to hear this. Also confused lol How do things come before 8 and 9? Amnesia? Some sort of time or other dimension thing? Sweet.
So far, it's something along the lines of "He did something so horrible that that regeneration has no right to call himself 'The Doctor'". It's going to explained (somewhat in Moffat's own special way probably) in the 50th Anniversary special this November.