There's been an episode a couple of seasons ago, with Tennant and Piper, when the story was fairly centered around a couple of people getting dragged into the Doctor's world, having to fight the Angels I believe.
I suppose they'll be able to spin a tale around it all. I just hope they'll do more than just make people run around and wave sonic screwdrivers at things. Which for the most part is what Doctor Who has been about since they started it again. (not saying that it's not enjoyable and at times great, it is, just not always)