2. There Are More Flashbacks
The Rumour: Vol. 2 will feature even more flashbacks to Peter's past, further delving into his origins (namely his conception and the identity of his father), his relationship with his mother, and what happened once he left Earth.
How Likely Is It?: Very. It worked incredibly well the first time in establishing Star-Lord's humanity amid all those quips, so some well-placed, probably Earth-set drama certainly wouldn't go amiss here.
In short, if the film has no flashbacks, it would be a legitimate surprise, even if some glimpses into the past are far from confirmed yet. 9/10