I'm wondering if the next season will see the return of the rest (or at least a good few more) of the Time Lords, I'm sure they can figure out a way to explain it. You'd have thought Steven Moffat will want to do something pretty major to mark his arrival (in addition to a new Doctor) and maybe that will be it.
Good to see The Master is coming back, not really a surprise though.
The master coming back hasn't been a very well kept secret. Throw in Rose, Donna, Sarah Jane, Martha, pretty much everybody who's made an appearance in the RTD reign, it's got the potential to be a big fucking RTD mess. There is a glowing redeeming factor of hope. Bernard Cribbins is the main companion as the wonderful Wilfred Mott. Donna has (surprisingly) been the best NuWho companion so far, and her granddad helped that.
Slight spoilerness, but Timothy Dalton has a roll as a kind of narrator for the episode, a timelord narrator.
I'm guessing that the doctor is going to take his new godly time lord power mad state of mine and go back and save the timelords. Nicely mirroring the crazy dalek from last years specials. Makes sense.
That episode has left me excited, which is ace. The first half really was pretty poor though.