After the events of Age of Ultron you see Tony Stark (Robert Downey Jr) walking down the streets of New York with a person with a red hoodie on. Stark says " Oh you know I can be a great leader if I was giving the chance" The mystery person says " I do believe in you Tony, and so does my team, you can count on us to be on your side" ( shadowing the events of Captain America Civil War). The camera then goes to the front of the street where you see Tony Stark's face. As you can't quite make out the voice you hear music playing coming from the mystery person. You see him drop his Sony TPS-L2 Walkman Player fall out of his packet. The then revealed music is labeled "Awesome Remix Vol 2". As he goes to pick it up, the hood falls of, and it is revealed (if not already obvious) to be Starlord ( Chris Pratt).
Now imagine how crazy that would actually be for Iron Man to have the Guardians of the Galaxy on his side for Captain America Civil War.