Rose is coming back...no matter how bad things are, can't that be good?

Billie Piper, known for her role as Rose Tyler in Doctor Who, was recently spotted filming alongside David Tennant and Camille Coduri [playing her on-screen mother Jackie] for David Tennant's two final episodes, combining to make a (at least) 2 hour special to be shown over Christmas time 2009, culminating with the Doctor's regeneration into his eleventh incarnation, played by Matt Smith, who will star as the Time Lord in Series Five in Spring 2010.

Rose Tyler was the Doctor's companion for all 27 episodes of Series One and Series Two, including the first ever Christmas special, The Christmas Invasion. At the end of Series Two's Doomsday, Rose was trapped on a parallel Earth, where she made frequent attempts to contact the Doctor as the Daleks threatened all universes with their reality bomb. She then used a Dimension Cannon, thus gaining entry to our Earth in Partners In Crime and Donna Noble's "Turn Left" Earth in Turn Left. It wasn't until the final two episodes of Series Four that she rejoined forces with the Doctor and the rest of his companions. In Journey's End, Rose found her soulmate in a human clone of the Doctor, and remained with Jackie Tyler and him on the parallel Earth.

So, if Rose did this, then why has Billie Piper been spotted filming Who? The explanation for this comes from an email recieved by Who fans. In it, it's stated that the Doctor will somehow travel into his own past (2005, to be precise) without knowing, and see Rose in early 2005 before she meets his ninth incarnation. She doesn't recognize him, so he asks what year it is, and she says "2oo5, mate.". The Time Lord then states that it will be a good year for her, the best of her life, and then leaves Rose and Jackie to wander off in the snow.

Personally, I think this last sight of Rose for the Doctor will be lovely, giving him some happiness before his regeneration. What do you think of this possible finale scene?

Also, an image by the Daily Mail website shows that not only will Ood Sigma return for The Waters Of Mars, but also for the finale two-parter. In the image, we see the Tenth Doctor kneeling in pain, with a possessed (red-eye) Sigma standing over him.

These two revelations are brilliant, but leave me with some major questions:

• If Rose sees the Tenth Doctor, at the time not recognizing him, then why does she not recognize him when the Ninth Doctor regenerates?
• How on Earth can Ood Sigma be possessed after the events of Planet of the Ood?
• Presuming both this and The Waters of Mars take place after the above mentioned story then how can Ood Sigma visit all these times in the past before the Ood events?

Hopefully, we'll find out all this and more this Christmas time!