SPOILERY SPEAK:
I'm guessing White Rose is fooling around with time travel or some sort of inter-dimensional cross over given that large facility he was shown in.....the nature of the lecture that scientist was giving those who walked in the hall with him.....and Angela's hint that White Rose has opened her eyes, and that she seems to think it can all start over again and be washed away. Plus, we already know the guy is infatuated with 'time'.
This would be an interesting yet dangerous road to pursue IMO given the fact that one of the most alluring things about the show is how 'real' it feels. You throw time travel or inter dimensional travel into the mix now....it has the chance to go off the rails. But I'll trust the story, it hasn't let me down yet.