I think the old woman, was Romana, however the show has left it vague incase Moff should want to bring Romana back properly in the future. It can be read that she is Romana, until its decided that it wasnt, and it does not matter.
Moving on, why is everytime Confidential showed the conker aliens filming, they had only the spikes on, and not the full green face, that bugged me.
I liked the end part of the episode, seeing all the companions again, the Doctors reward being that he can save his friends, Luke from the car & Martha (& Mickey) from the Sontaran. Dont know if the Doctor should be helping Jack score, but what the hey it was nice to see all the aliens together like that.
Moving on to the bulk of the episode itself, the return of the Time Lords is a bit wasted, why bring them back only to get rid of them again? A bit of a fudge as to how they survived the Time War and broke the Time Lock, but maybe on a second viewing that will explain itself better.
Also not sure how Donna survived, she seemed to remeber, but didnt die, just knocked out a few Masters and feel asleep. Again second viewing maybe.
All very enjoyable, but looking back most of the stuff with the Time Lords and the Master was pretty pointless, with two easy resets.
and finally the 11th Doctor, whilst I am encouraged by the trailer, there isnt much Matt Smith did differently from Tennant, check the body parts, regeneration madness, all very the same.