10 Outrageous Guardians Of The Galaxy Vol. 2 Theories
10. It'll Once Again Open With Young Peter
Guardians Of The Galaxy began big, with that scene of Chris Pratt, dancing goofily and stealing the orb, giving us the perfect introduction to the character Star-Lord and setting the tone for the entire movie in the process. Before that, though, there was a pretty emotional flashback sequence of Peter as a child on Earth, witnessing his mother's death before then being abducted by Yondu.
This theory, then, is that the sequel once again open with a scene of young Peter, picking up right where the first one left off. It'll show him as he first arrives on-board the spaceship, and how he deals with the new environment, before progressing through his training and his teens.
This involved theory then goes that Guardians Vol. 3, assuming that will be made, will finally complete Peter's journey with Yondu, taking us to the time just before we first meet him in Guardians as the cocky-but-endearing Star-Lord. There's no obvious reason this can't happen, of course, but it probably wouldn't work as well without the emotional hook of the first movie's flashback.