Here is some new info from the commentary of voyage of the damned, it has some really good information about the next series.
Episode 6 contains a monster called The Haff
Episode 11 contains Catherine Tate's best performance yet
In episode seven, anchovies are used as a remedy by the Doctor and also involves Agathie Christie.
In episode eleven Rose, Martha and Donna will be working together with the Doctor lost in space.