Although there are some things that have not all been tied up (why didn't the Silence try to do something about this?), some loose ends and unanswered questions seem to have been wrapped up nicely. And one of them is the question of whom the Doctor saw in his room in the “hotel” in the episode “The God Complex.”
Unless you think he saw Steven Moffatt…
UPDATE: Saw this one on Facebook, which I think looks better than mine:
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