I sure hope not. Give me Tegan or Leela or even a recast Romana (but Lalla Ward would be marvelous, too)! I actually don't want Donna to return because I don't want them to reverse the tragedy of her ending.
I do. If a few hundred years is enough for the Doctor to figure a way of saving Gallifrey, I'd like to think s/he has been on the case of reversing the DoctorDonna issue a bit better than "mind rape" for a few decades, minimum.