It appears a Guardians of the Galaxy scene is currently being filmed for The Avengers: Infinity War.
Pom Klementieff, similar to Sean Gunn, took to her social networks to post a pic of herself wearing an Avengers: Infinity War winter hat in which she included the #infinitywar hashtag.
It's not exactly known how the Guardians of the Galaxy will play into Avengers: Infinity War, but we can speculate that possibly something happens at the end of Guardians of the Galaxy 2 to get the Guardians to head to Earth, or maybe they even become involved in some sort of outer space battle against Thanos' forces.
Guardians of the Galaxy 2 hits May 5th.
"The Avengers: Infinity War" has a May 4, 2018 release starring Josh Brolin as Thanos. Marvel Studios has yet to officially announce the cast, but the following are thought/confirmed to be a part of the movie: Robert Downey Jr., Chris Evans, Chris Hemsworth, Mark Ruffalo, Scarlett Johansson, Jeremy Renner, Cobie Smulders, Samuel L. Jackson, Sebastian Stan, Chris Pratt, Zoe Saldana, Karen Gillan, Dave Bautista, Bradley Cooper, Vin Diesel, Paul Rudd, Elizabeth Olsen, Paul Bettany, Chadwick Boseman, Benedict Cumberbatch, Benedict Wong, Tom Holland and Brie Larson.