I love that basically ANYONE could be Uber A again. Anyone (starting w Peter ending with Big Rhonda) can come out of the dark and say "i knew charlotte for a long time".
I personally love the MelissA theories. "It's the old Campbell farm. We used to bring the girls here when they were little".
It'd explain why we could hear her forcing Wilden to push the box with Aria out of the train. "Damn Push it already!" and then saying "Those bitches will be there at 9" to protect the girls. Charlotte erasing the footage of Melissa on the train + attacking Hanna when she was about to see who changed Ali's medical records screams CHARLOTTE WAS PROTECTING MELISSA
It would also support the theory Black Widow was supposed to be Melissa, but was changed to Sara so that Melissa could be the final Uber A. The 5 years forward plot was invented half way through season 5 and that's pretty much when Varjak's phone number spelled out Sara's name.
It all makes sense, doesn't it? All aboard MelissA bandwagon, now!