I'd guessed from your not-so-cryptic comments as to what this was about, so figured I'd click on the link and confirm it (with that kind of announcement you know it's going to be all over the papers and whatnot anyway).
And, awwwwww. I have to say that I'm not as sad as when Eccleston left *WAIL*, but he did do a good job.
I really hope they manage to get past this whole thirteen's-yer-lot on the whole regeneration thing, though (as with the Leader), as otherwise we don't have many incarnations of the Doctor left...!