The second episode in season seven of Doctor who has Amy and Rory back as usual companions as well as some other interesting characters. The episode is called Dinosaurs on a Spaceship and so I feel there might be a plot clue there as well.
The BBC have released a number of wallpapers for the episode which feature a number of characters, a spaceship but very few dinosaurs.
There were 5 published wallpapers and they were numbered; 1, 2, 3, 4 and 6. Notice the missing 5?
Update: All these wallpapers can be found, in a different size, in a larger gallery here.