I'm skeptical of the Doctor, who has always been male, becoming female (the Master is yet another example of timelord regeneration). I know looking for logic/consistency in "Doctor Who" is something of a fool's errand, but I'd still ask 'why?' (apart from the fact that our culture is now sufficiently enlightened to do so and who cares because it's a silly sci-fi show that doesn't make any sense anyways).

Stodgy fans like me could be won over, but I fear the writers would struggle with the different dynamic of a woman Doctor. And if the Doctor continues to be male, I don't know how many fans will handle that disappointment following so closely on the heels of the birth ("heels of the birth" should be a saying) of not-princess George. And on that count, might that disappointment perhaps play a role in pushing them toward a female Doctor?

I'm with Bingo on the ruining of the surprise.

In general, I'm with Anchorhood on Miss Watson's potential. I've previously suggested she play Luke/Leia's mother in a proper prequel.