No it hasn't. (Unlike in the 1996 TV movie, where they quoted it along with just about every other geeky factoid galned about the Doctor over 26 years as if these were actually things awhole new audience for the show actually needed to know from day one... =:o\ )

And besides the limitation was broekn by the Master in very same story where it was first ever mentioned, and at least twice more since, so there really isn't a problem there as to *whether* they can do it. Personaly, I hope that rather than some silly handwaving fudge, they actually make it a serious moral dilemma... Not for the Doctor himself, but for one of his friends. "You *can* save him... But there are only three known methods of doing it, all of which require somebody else to die." And maybe the friend sacrificies him/herself, or maybe they manage to find a fourth way... Or maybe they don't, and put him into the body of some minor villain's side-kick while he (the Doctor) is unconscious, and then have to lie to him afterwards about how they did it to cover up the fact that the body donor was not actually a volunteer, but went down kicking and screaming...

And the person who finally breaks the news to him, of course, is the Master. =:o}