Doctor Who Theory
So, I have this theory for this short series with Doctor #14 (David Tennant who was previous Doctor #10 from 2005 - 2010) and Donna Noble. Now if my theory is correct, this short series will make a lot of whovian's cry, but it will also make a whole lot of sense.
Way back when during the episode "Journey's end" Dalek Caan prophesied of the coming of a "three-fold man", of "the Doctor's soul" being revealed, that the "Children of Time would gather" and "one would die".
But here's the thing, no one died back then. Donna was the only one who came very close, twice, and if it wasn't for 10's mind wipe, and the subsequent mind wipe during the episode "The end of time", she would have.
So my theory is this. By the ending of this short series that we will have David Tennant as the 14th Doctor, we will sadly lose Donna Noble as she remembers her past with him and her mind burns and she dies.
In conclusion, Dalek Caan's Prophecy becomes reality as "One of them will die" comes to fruition.