The rumours about ex-EastEnder Michelle Ryan being the next Doctor Who companion could be half true, if eagle-eyed posters at Outpost Gallifrey are proven correct. She has apparently been spotted on set for the first day of filming for the next Special, "Planet of the Dead", which took place today at the National Museum of Wales in Cardiff. Since Russell T Davies has said that each Special will have its own companion, for once the tabloid speculation could be right - Michelle Ryan is the new companion... for a hour or so at least. But this also implies that she won't then go on to be Doctor 11's long term travelling companion.
So, still hope for Jemima Rooper yet.