
Anyway, at the end of tonights episode was a "Coming up" clip segment of the new season, and what looks like episodes 8 & 9 featured a scene that showed the new assistant being swallowed up by the ground as the Doctor tried to pull her out.
http://www.youtube.com/watch?v=biKRu2VLoKs
The VERY quick flash of the scene appears at 1'46"
Certainly looks promising..
And even if the scene is a loser, the new season looks brilliant.