For an episode titles "Let's kill Hitler" he wasn't in it much. That being said I loved all the twists and reveals. The regeneration mania was handled very well and it all answered some questions while brining up others as a good episode should.
My thoughts:
We will probably be seing the mini-justice people again.
Somehow River will save the Doctor. Though his death being a fixed point is a little sticky. They have to find a way around it though because I can't see Matt Smith playing the doctor for 200 more seasons.
On a related note Captain Jack from Torchwood is also a fixed point in time which is why he is immortal but in the current series that has been revoked. Maybe somehow they will tie into each other?
Glad the show is back on and look foward to next Saturday.