It's no secret that Avengers: Infinity War is shaping up to be the team up movie to end all team up movies. Bringing together a ton of different flavours and tones under one roof is a big task, and how the Russo Brothers divide screen time will be important.
If this rumour is to be believed, we may know one of the key players now. According to SchmoKnows, Star-Lord is set to have a "sizable" role in the film, as well as being a "major player". On top that they say Peter Quill 'will be the first of the Guardians to make an appearance.'
This of course is an unverified rumour, so adjust expectations accordingly, but this would make sense. With Thanos coming into the world, Quill seems like an easy cosmic foil to hang a lot of the story on. On top of that, Chris Pratt is one of the biggest stars in the MCU now, so that wouldn't hurt.
It seems this story was deleted by the outet, specifically after James Gunn shot down a rumour about the Elders being in Guardians of the Galaxy 2. Seems the overall source might have been a ill informed on this one.
Still doesn't change the fact that I think this makes total sense.]