Spoiler (sort of):
DC continuity is a mess, I was thinking that Dr. Wells was going to be Professor Zoom for a while. It should be remembered that Professor Zoom sort of started out as an ultimate fan of The Flash's from the future until he inevitably went insane and became a villain. His motive in the past has literally been to make The Flash into a better well... Flash.
Given how insane and contradictory it gets it seems to me that they dropped a lot of the weirder stuff from it and I've been thinking that the "gimmick" is going to be that something similar to "Crisis On Infinite Earths" happened and The Flash sacrificed himself to stop (or perhaps fail to stop) some equivalent of the Anti-Monitor, which would of course need to be defined differently given that whole storyline was insane and The Flash's sacrifice was just one part of it, however he basically became pure energy and travelled back in time to become the lightning bolt that struck himself in the past.
I've been guessing that Wells is going to turn out to be trying to train Barry to be stronger so he can do a better job when that inevitable threat shows up. Probably some reveal like "I killed your mommy to make you hate me, so you could become stronger than me and save the world....". So yeah, I'm guessing Wells and Reverse Flash/Professor Zoom are the same guy and have been for a while. The whole "malevolent mentor" thing can fit the M/O albeit it's being done a bit differently.
That said bringing in "Firestorm: The Nuclear Man" seems like a mistake, though I suppose it makes sense if they are going to turn one of the current heroes into a villain, they will need someone to fill in for her. See, Firestorm doesn't just have fire based powers, he re-arranges molecules, and that's sort of point of the character rather than just being a Human Torch wannabee. To put it into perspective at the end of "Our Worlds At War" he's one of the guys supercharged Superman got to make his final charge (along with Captain Marvel). During this Firestorm mentions that he could turn 1" of the world's surface (all the way around) to water which had people going "WTF, can he acutally do that?" (yes, he can). Even if they power him down a bit, I think molecular rearrangement might be a bit too cool a power if they want him to play second fiddle to The Flash. He's really a character I'd think would need his own show to thrive, if they just turn him into fire blaster #347 what's the point of having Firestorm other than just name dropping him?