If he is innocent, it should be overturned.
However, I cannot imagine how 12 different people, including men and women, who unlike us have seen all the evidence, could have previously come to a unanimous decision that he is not innocent, if he was in fact innocent. Mind you, it is definitely possible that all 12 of them made a mistake, but it just seems so unlikely. Furthermore, showing up uninvited at the hotel (he was invited by his friend, but there is no evidence that the semi-conscious woman was complicit in that invitation, while there is evidence that she was already incredibly drunk at the time), and then climbing out of the window and leaving via the fire-escape doesn't sound like something I could see an innocent man doing either. So on balance, I voted "no".
Either way, he will play again, if that's what you are worried about. I don't have a problem with that, either - every criminal who has served his sentence must have a chance at rehabilitation, however much of a jerk he may be.
Can't understand his girlfriend though, what a douche she is.