Well… As the series has focussed on memories, mentioned two ‘names’ (as in reputation) of The Doctor (is it The?), had Clara splintered in time and seen a timeline repeated until it was ‘fixed’, I have a little theory.
The Doctor is called to Trenzalore by, it seems, The Whispermen (mirror to Silence?) to answer that mystery question. If it is what the title says it is, it’s defining himself as one of those Doctors. Why has he run from that? Well, that’s beyond me really. Could be setting a thing in stone, authority, that. Because it’s a place where truth must be told, he also learns what Clara is/becomes from that splintering. Perhaps he ‘fixes’ that so it didn’t (well, doesn’t) happen. She lives on as present Clara.
The Silence (who I think are still about, just as he is) sought to stop it being answered as, if he chose the first meaning, the original meaning, that would cancel their reason to exist – their endless war. They’d fall. It would also mean River never became a weapon and possibly that Rory never punched Hitler. Unsure what other effects that timeline editing would have though.
I bet that’s much too simple and I’ve missed something (or several somethings) important. That’s what I do.
Oh yeah, do we know any dead characters? Living creatures may not speak falsely or refuse to answer.
