The content of this post origionates from http://lifetheuniverseandcombom.blogspot.com/
I saw a post earlier to day on Combom and I was pleased to see it. Combom reports recieving an email in which the sender states that Rose Smith and the other Doctor will be returning for 4:18 in scene 163. It seems that the scene will be in a public place and so that could been pictures.
However the big question is- Who is Rose Smith. When the Doctor has acted as a human in the past he has used 'Smith' as his second name and so has the other doctor from journey's end married Rose and used the surname Smith.
The next question is why would they return in ep 18. The Doctors regenrating and so the other Doctor feels this, or worst scenario he dies when the Doctor regenrates; leaving Rose with his child. Tennant did say he cried when reading it.