Howling:Returning companions in cameo roles

The Daily Mirror has an article revealing that Rose, Donna and Martha will be returning in cameo roles in Let's Kill Hitler. It also says the Daleks will be making a return this series, as shown in a montage of clips from later in the series shown to a private audience. The Daily Mirror isn't the most reliable source in my opinion, but the chance for the return of some old companions is there. I'll leave the source below:

http://www.mirror.co.uk/celebs/tv/2011/08/17/billie-piper-freema-agyeman-and-catherine-tate-all-come-back-for-cameo-roles-in-doctor-who-115875-23350006/

I also saw Karen revealed a few details about the series aswell. There might be spoilers in this article:

http://www.mirror.co.uk/celebs/tv/2011/08/17/karen-gillan-reveals-secrets-of-the-new-doctor-who-series-115875-23350010/