Apparently, we're getting Donna back! Yay!
I loved Donna (and this means that we don't have to go over "it's bigger on the inside" again!). Donna grew so much over the course of The Runaway Bride. Plus, she had absolutely no sexual/romantic interest in the Doctor. Plus! She knows about Rose. There is nothing bad here.
I am entirely made of squee at the moment!
Donna! Yay!