So, after watching the last episode of Fringe, it appears they jumped back into the main story line after much filler.
One thing I had been bouncing around with previously in the series:
William Bell and Walter Bishop being alternate universe versions of the same person. And this idea was further reinforced in the latest episode. Walter found a pair of old glasses in his paper work. Putting them on and looking into the back of a metal pan for a mirror, he looked remarkably similar to William Bell. I know they had done this on purpose, they had to have.
The only thing I can't place is Peter. Walter stole Peter from the alternate universe. This means that he kidnapped him from the alternate version of Walter/Walter's wife. That would mean that William Bell (alternate-Walter) is Peter's father. So how could Walter and William be such good friends if Walter did steal his son?
Regardless, there is a much larger connection between William and Walter than just coworkers
The next episodes will be interesting. Taking a look at the past. Maybe they'll have more answers.