I haven't really given my feelings on the issues being raised due to the possibility that two specials will be made in America, mainly because of the source of the claim....
News of the World ....so the possibilty of it actually happening is low.....very very low....
However if it does happen, I have no real issue with it at all, all it will be is a story taking place in America, like Fires of Pompeii was shot in Rome....
And if there is an American assistant, well then it will still be a one off, or two off in this case, as I am more than convinced that RTD is not going to lumber any of his creations on Moffat....
I don't think it will be to appease the American audiance in risk of losing the prime British audiance, like I said before, RTD is more than aware of how well DW is known there...
If it is happening, it will be just the Doctor landing in America, bumping into the potential assisstant, having the adventure, then saying goodbye....the end....and we don't see the Doctor untill the next special or next series depending when these specials are aired
Some people seem to be scared that it will be the TVM all over again, personally there was nothing more American about that than there was of the Daleks in Manhattan and Evolution of the Daleks....its just that on both counts it was the stories that failed to impress the majority( I personally enjoyed both


), rather than because they were "too American"
Well that is what I feel anyway