I mean, the world will collapse because of his name? I don't think that's actually all that matters? Isn't the who what matters? It's not Moffat's best idea, but it might turn interesting...
Oh, no, no it won't be that. While it's quite true that it is the 'oldest question' and is 'hidden in plain sight', it's evident that it won't be what the Doctor's real name is. Took me a while to realise that, haha.
It's someone. Someone the Doctor knows of. It isn't "Doctor who?" but "Doctor, who?" As in "Doctor, who is it?"
I don't think the Christmas special is the fields of Trenzalor, at the fall of the Eleventh. It hasn't had enough build-up like a season arc. It might be, however, the Oriental Express in Space.
Bring. The. Bloody. Daleks. Back.
Jesus Christ no. While I appreciate that they have fought every single incarnation of the Doctor (we never saw them expressly against Eight, the intimation from Nine's debut episode is that he is only recently regenerated, and that he would have done so only in the last time of the Time War, so that would make Eight the incarnation to have fought in the Time War)
Also...
Mighty Morphin Dalek Rangers