You must know that Karen Gillan is going to leave Doctor Who some time in the next season. She will stop acting the role of Amy Pond and the departure will be permanent: she says that she does not want to come back in other episodes of Doctor Who in the future.
There is a 2 page interview on IGN tv about the reasons of this departure: she needs a change. It was her decision and she talked to Steven Moffat about leaving the show. How she’ll do it is still a secret, but it seems that she’s leaving in the blaze of glori.
There are some interesting things said there, just read it.