Just came across the following... not really a big spoiler, although I do know more. ;) But this one just caused a giggle fit, so I had to share:

Meanwhile, Ballykissangel actress Dervla Kirwan is to star with David in this year’s Christmas special of the hit series.

Dervla has been spotted filming on location in Newport.

http://www.thesun.co.uk/sol/homepage/showbiz/tv/article1040588.ece

The article contains the other big spoiler I know about the special and it is very SQUEE-tastic IMHO.

So what's funny about Dervla Kirwan being in Dr Who? Well, I checked her imdb and she played Casanova's (aka David Tennant's) MOTHER in Casanova.

:24:

(Um yeah for some reason I find this extremely entertaining... )

Oh and also... this is some kind of major speculation/ spoiler (well hopefully foiler) so I'm still spoiler fonting)

Remember that article with the MAJOR SPOILER for TW and DW? That said that John Barrowman would leave TW, Marfa would come back etc? Yeah I know some of it still came true BUT remember it also said (and that was WEEKS ago that they were filming the last of the 4 special eps already and DT was filming his final scenes as the Dr right now? Well... looks like they're only NOW filming the Christmas special! The FIRST of the 4 specials, not the last one... and no, no need to remind me that they film episodes out of sequence. I just DO NOT BELIEVE this spfoiler!!! *lalala*