As far as I read on the internet, it seems that we have to wait about 9 months for the next episodes of Doctor Who. They are meant to be released only in the autumn of 2012.
According to that, the schedule for the next 2 series of Doctor Who looks like this:
Autumn â€“ Series 7 Part 1
Spring â€“ Series 7 Part 2
Autumn â€“ Series 8
So the Christmas special is in the middle of the season rather to its end.
Karen Gillan (Amy Pond) andÂ Arthur Darvill (Rory) willÂ leaving Doctor Who during series 7. You can watch hereÂ her interview taken by the ABC radio.Â River Song will return.