Okay, long day so here's the short version. Random thoughts may or may not connect to one another.
The remaining episode titles are The Last Sam Weiss and The Day We Died . I think both episodes are the finale; one from the point of view of the blueverse and one from the point of view of the redverse. I fully expect the final episode to be utterly gut wrenching and end with the possibility of the Observers stepping in with some sort of re-set. I don't know exactly what that would mean for S4, and I'm very wary of the idea of a JJ re-set. I take comfort, however, in the thought that JJ may be approving the route but he's not steering the boat.
I'm fairly certain that Sam Weiss is one of the First People. I have no idea what that ultimately means or in what way he is untrustworthy. I sort of vaguely wonder if Peter is also a First Person, just without the memory of previous incarnations. Who knows, maybe Olivia is, too. Maybe everyone is an incarnation of a First Person and only Sam carries the collective memory of the original society. (helloooo tangent) Anyway, the whole faith, ability, destiny thing kind of gets my synapses all atingle.
I doubt we'll hear much more about him this season, but I still wonder about Bell. We've seen self-sacrifice from him, but all the info we've heard about him when he wasn't around was about founding ZFT and starting the Cortexiphan trials basically to build an army for this war between universes, then designing shape shifters and weapons for the red side. And he's somehow connected to Sam Weiss. I think it could be argued that his crimes/sins/whatever are much worse than Walter's. Even at his worst, Walter is acting out of love.
Those are my sleep-deprived ramblings. If I get a chance tomorrow, I'll try to check in and see how far off the rails I went with this post.