silver wolf009 said:
I think the deal with time lord regeneration is that they cant change sex or race during but im not sure that im 100% correct on that. Really I dont see any reason why they couldnt but it all depends on the actors skill.
It's been implied before that they can. Not the least of which being Matt Smith's introduction as the Doctor, in which he thinks for a moment he's a girl.
The Ninth Doctor said he could regenerate with two heads or none, and that's only dipping back into the revival.
Pretty sure if we can have a headless doctor, we can have one with a lot of melanin.
Will we see one? Don't know. Don't really care, either. Long as the Doctor's good, he can be black, white, or purple for all I care.
EDIT: Also, I really hope we don't see someone Morgan Freeman's age. I mean, I love the dude, but I can't see him keeping the pace of the recent series well.