By the way, Doctor Who Confidential for Closing Time was hilarious; Matt Smith and James Corden (Craig) are making their own little Doctor Who episode using their phone. I won't spoil but it is like the best thing ever.
As for the vision the Doctor received in his room, according to Confidential (really something you guys should invest in watching after the weekly eps) they expect fans to debate that question for years but it isn't something they are going to answer.
I have seen a few comments that the Cybermen in Closing Time were underwhelming. I propose that the episode was not supposed to focus on them; it is a typical episode in the new Who's where they let up on the stress a little bit before sinking into the finales. That said, the final confrontation with the Cybermen, The Doctors goodbye to the children - both were very emotionally charged scenes.
My only major complaint is that Matt and James have such excellent chemistry that it is almost a crime that they will likely not be seen together on Who again.