And hopefully the big reveal will also explain the birth certificate that peter had in his hand in the Arrival.
Here is a refresher:
Fringe Easter Eggs: Fringe Episode 104 - Certificate of Birth
Why would a picture of him be rubber banded with a birth certificate of a guy who clearly isn't him?
I may be WAY out there but could it be that peter has a son? The certificate states that the birth was in 1999 which makes him 10 years old. I know, I know. Just speculating.