The fight against the Observers intensifies and a Fringe Team member plans an attack of his own.
Gee, I wonder which team member that might be?
We just watched 'Through the Looking Glass' again last night, and I'm now convinced of two things: the kid is indeed September, and the radio that's jammed to a certain frequency will have something to do with the Numbers Stations. I have no proof of either thing, just my gut, but they certainly seem like they're trying to tie in as many elements from earlier in the series as they can.
As for Peter's continuing transformation, I found this image kinda interesting:
Let the speculations begin!