Well as DT has finished filming for the xmas special, I'd be surprised if this is a real regeneration! His severed hand in also got several prominent shots, in the finally it was down on the floor on the right of the shot instead of its normal place on the console so I get the feeling that's going to be involved in the solution somehow.
Also this episodes just reeks of 'the big reset button' syndrome again. Admittedly with a story based on time travel it kind of evitable that somehow the whole thing is prevented, and with such worldwide devastation, they can't really just put the planet back as is but for once a different course of events would be nice.
Anyway, I'd love them to fill in a bit more of the back story for the Time War. There is a line about Davros meeting his end in his command ship at the jaws of the Nightmare Child. I'm intrigued by what the Nightmare child is, if it's a warship then to me it says quite a bit about a race that would name a ship that! Certainly doesn't conjure up an image of a peaceful race 