No clues last week, although the Confidential had incoming showrunner Steven Moffatt talking about other stories in which the Doctor meets people he hasn't met yet, in particular the Elizabeth I moment from "The Shakespeare Code", which suggests that we might be seeing that implied story at sometime. Still, the library two-parter was a great bit of storytelling, and the series is in safe hands with Moffatt.
A surprisingly good story this week too. Very tense, with some interesting things to say about humanity and the Doctor's faith in the race, quite spooky in parts, and a nice contrast with what looks like some epic storytelling coming up. We also got another cameo by Rose, another mention of a lost planetoid, and another mention of the mysterious "Medusa Cascade".
The upcoming story, probably another multi-part finale, looks to be quite epic, and I hope Russell T Davies is up to the challenge. I'm still not looking forward to bloody Davros though.