There's too much random stuff going on with the Missy character and the Promised Land to even try and figure it out. It's really not even interesting at this point. At least the series arc about the cracks in the wall was intriguing and seemed to fit into the episodes. Anyway, I'm sure the end result will end up much more disappointing than any cool fan theories we can come up with. After the massive disappointment that was the 50th and the generally bland first episode this season, I'm not holding out much faith in Doctor Who this year. I'll keep watching it obviously, but it's bugging me. Kind of like how I'm still going to watch the Walking Dead even though a five year old could write a better script.