Are we talking as far as series 3 and 4? I've already heard about that. Both 3 and 4 will be adapted from A Storm of Swords.
The Doctor: There's one thing you never put in a trap, if you're smart, if you value your continued existence, if you have any plans about seeing tomorrow, there's one thing you never, ever put in a trap... Me.
-Doctor Who: The Time of Angels