Very likely himself and/or the TARDIS. (Thought I heard a sound effect from the console room.) He initially thought that it would be what he most feared, but actually it would have been what would elicit from him the most potent sense of faith, unless the line about leakage is to be believed. Interesting that it was room number 11, too.I wonder who the Doctor saw in his hotelroom. Maybe himself?
I'm not buying what he said about the person "steeped in the blood of a thousand galaxies" not being him, either.
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