Surprising Cameos in Doctor Who's Next Episode?

Are some of Doctor Who's trustiest companions coming back in this season's "Let's Kill Hitler"? According to the ever-reliable* British tabloid press, they are.

Spoilers ahead...

Rose Tyler (Billie Piper), Martha Jones (Freema Agyeman) and Donna Noble (Catherine Tate) will all appear in the next episode to offer their help to the Doctor in his hour of need, according to the Daily Mirror and the Daily Mail. It's a brief, funny cameo, but it opens the door for them to make more reappearances in the future. No explanation, though, of how they would deal with the "Donna can't know about the Doctor or her brain will explode" issue. [Thanks David!]

* Not really.