I think they intentionally left the curator pretty fuzzy, and I'm actually OK with that.
Future rumor spoilers, but minimal to answer a question:
If what I've seen elsewhere today is true (and there are as many reasons to think it's not as there are reasons to think that it is), the question of numbering will be a plot point in the Christmas episode.
More detailed followup:
The rumor is that they will be declaring that Smith is the 13th incarnation of The Doctor, which is why he's supposedly buried at Trenzalore. The numbering would be 1-8 as traditional, then Hurt is 9, Eccleston is 10, Tennant is both 11 and 12, because of the time he regenerated into himself using his severed hand to stay as the same guy, and thus, Smith is 13. Clearly, if this is correct, they'd be somehow either announcing that he gets another 13, or that he gets all the regenerations he wants or something, since we already know that he regenerates into Capaldi during the Christmas special.