It doesn't seem likely that Peter Quill and Han Solo will join forces in either of the upcoming Guardians of the Galaxy or Star Wars: Episode VII — even if it's not entirely out of the realm of possibility, considering both franchises exist under Disney's massive roof.
Much more likely is that we'll continue seeing mashups of the two Disney-owned properties, like this:
A Star Wars trailer, recut with the same musical cues (including "Spirit in the Sky" and "Hooked on a Feeling") and the overall funky vibe of the latest theatrical Guardians of the Galaxy trailer. We always knew Chewbacca and Groot had something in common.
Guardians of the Galaxy opens on Aug. 1, while the next new Star Wars movie arrives on Dec. 18, 2015.