The Verses and Timelines of Fringe
This is my attempt of figuring out the timelines and verses of Fringe post S3 finale. What has happened with that cliffhanger is a bit like Back to the Future II where there were multiply versions of Marty's timeline.
Blue Verse: Peter kidnapped in 1985, Walter crossing over caused the Red Verse to start crumbling. Everything we have seen on the show up until 03x22
Red Verse: Same major events as the Blue Verse in that Peter was kidnapped, Walter caused their universe to become unstable. Destroyed sometime between 2011 & 2026 after the machine was turned on.
Future/Black Verse: The future of the Blue Verse which as far as we are aware stops in 2026 as Peter's choice at the end of The Day We Died should have altered that future.
The Bridge Verse (using Yellow for now until the show gives it a colour): This is a universe where Peter never existed. The two worlds still went to war but for a different reason that we don't know yet. Don't forget William and Walter were experimenting with crossing universes before 1985 so something could have happened then.
In theory everyone should be different in this verse because their lives haven't been effected by Peter. Also some characters previously dead could be alive and vice versa.
There should now be a future for the Bridge Verse which if everything goes well differs from the Black Verse