Quote from a random thing my mate found on wikipedia somewhere:
"In "The Stolen Earth" the tenth Doctor is shot by a Dalek while running toward Rose. Captain Jack, Rose and Donna bring the Doctor into the TARDIS where he begins the regeneration process. However if he regenerates into his eleventh incarnation it would theoretically create a paradox as he has to meet Professor River Song in his tenth reincarnation for her to recognise him, as stated in the "Forest of the Dead", as well as Queen Elizabeth, who declared the Doctor her sworn enemy in "The Shakespeare Code" - though considering the Ninth Doctor's statement that Time is in flux, this may not be the case; further, Tennant is contracted to play the Doctor in 4 specials in 2009[6] The Doctor's hand, being part of his genetic code, is attached to the TARDIS. This means that theoretically, since the TARDIS aids in regeneration, The Doctor will not change form."
I dunno, the Forest of the Dead part is a bit dumb because didn't River say she recognised the Doctor from his eyes, and could tell he was a younger Doctor than the one she knew, but not so much recognised his form? I forget
The Doctor's hand bit makes no sense to me
but I did notice that they focused on it a bit, had it out in the open for us to see and everything, so maybe it will be an important part in the show next week.
Other than that, the fact he's meant to be in four specials in 2009 I guess suggests that he probably doesn't die, unless someone's got that wrong.