Russell T Davies has said that there are no plans for and American Doctor Who.
Fans have, after Torchwood moving house to the US, that Doctor Who would follow suit. Last year rumours even occured.
RTD told the Radio Times:
"No one at BBC Worldwide is looking at an American version of Doctor Who."
“I know everyone thinks we have secret plans. But we do have plans for new dramas, and non-science fiction drama. It’s about time I got back to that sort of material, ’cause I have a lot to say in that world. So our ambitions are endless – but not for that particular one!”