I am the Kat that Walks By Itself

The only snag with that idea is that we've seen what happens to a Flesh entity when they die, and the Doctor's death didn't fit that pattern.

However, in "The Almost People" the Doctor said that travelling in the TARDIS stabilized them. Which means it could still be the 'ganger-Doctor. But I don't think it is. Moffat has been too adamant that it was the real Doctor that died.

The main thing that bothers me about that is that if they're really going with "the Doctor dies forever at 1100 in his 11th incarnation" then they've locked themselves in to never having another Doctor after Matt Smith. Which doesn't seem to me like the kind of thing the BBC would want to do.