Just got some wonderful set reports from Scooty and PMount about the finale! (THANK YOU!) Apparently it was the last scenes of the final episode that were being filmed, and they included:
Not a lot to see filming-wise at first but then David Tennant appears at the porch of the house in his brown suit. There's Bernard Cribbins in a cardie and Catherine Tate in a mid-length light brown leather jacket and trousers. They rehearse and record a scene where Donna's on the ground, Wilf shouts "Donna!" and he and the Doctor help her to her feet. This is filmed two or three times.
Then a different scene was filmed with the Doctor and Wilf which PMount wonderfully got quite a bit of dialogue of:
[Rain is falling. the Doctor, on the porch, looks up at it.]
DOCTOR: Get a lot of this. Atmospheric disruption... Bye, Wilfred.
[The Doctor moves off. Walking back to the TARDIS in the rain, but he turns back to Wilf and calls out]
DOCTOR: You can never tell her!
WILF: What about you? All those friends of yours....who have you got?...... Next time, at night, when the stars come out....I'll look up and I'll think of you....out there on your own...on her behalf....
[The DOCTOR sadly turns away, gets out key, opens the TARDIS, and goes inside.]
So quite ominous and sad for an ending.. and doesn't it mean that the Doctor will be companionless for the Christmas special? There was no sign of Martha or Rose..
And heres a short video of the filming, but it just shows Tennant getting into the TARDIS and then getting out of the TARDIS and drying his hair with a towel... still... its Tennant!