The BBC have released another trailer for the Doctor Who Christmas Special. We get a first peek at the ice lady that we mentioned here in August. We also mentioned rumours that this ice lady may kill Clara! (we also see the ice lady hitting some sort of force field and then exploding towards the end of the trailer) We also get a sneak peek at the stairs leading up to the TARDIS which we can assume is waiting in the clouds (based on the doctor walking on some).
You can see the new trailer below and some of the more interesting screencaps: