But I'll be nice and cut for spoilers.

I'm not convinced the Daleks were the ones who stole those planets and put them in that alignment. And I certainly don't think they had the wherewithal to hide the system one second ahead in time. But we do know, as the Doctor pointed out, of some people who could do both things with relative ease. One group in particular.

Yup. I think we can soon haz Tiem Lords.

The trick, of course, is that they're locked away. They need a key. A powerful key. And I remember one particular key that, among its disguised forms, was human. I'm wondering if Donna is actually the Key to Time.

Of course, I'm probably way off on this, but it's fun to speculate. Red's theorizing that the Rani is behind all this, lurking inside Donna. I'm not convinced, but it's certainly got as much merit as anything I came up with...