Everything is pointing to The Next Doctorbeing a Time Lord, and probably The Doctor from the future, so will heregenerate at the end of the Show? And who into? We are promised a surprise ending after all.
So who will he regenerate into? A previous Doctor such as Paul McGann? Doctor Ten? The Master? Another Time Lord we know from the classic series? A Time Lord who knows the Time Lords are not lost, and their location? Or something else?
There are so many options, I suppose we have to wait and see!