Sadly, there's a Game 7 of the World Series. This means no Fringe on the night of 10/28/11.
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Witness the return of Peter Bishop in this video, Fringe fans. He seems to have no idea what has happened to him.
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Oh, yes, Peter is back on Fringe! But it's far from that easy, as teased in this preview for the episode "Novation."
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Fringe Season 4 Episode 5 Quotes

Olivia: Walter, he says you're the only one he will speak to.
Walter: Me?
Olivia: Walter, he says his name is Peter Bishop. He says he's your son.

Well, what choice do I have? I've been haunted for weeks with visions of a strange man. And now the man is here, in the flesh, in our midst, and no one will let me examine him or even see him. I'm kept in the dark knowing nothing. How's a man supposed to get some rest with all these uncertainties?

Walter