The actress has said that we’ll be getting more of the history of Nebula and her relationship with her father Thanos.
Whether this means that Nebula will be less of a bad guy in the new movie, or will become so throughout the story, is unclear.
It does sound like we’ll be getting to know Nebula much better over the course of the new Guardians which may very well play into whatever role she will have in Avengers: Infinity War.
While Nebula was a significant villain when she was introduced in Guardians of the Galaxy, Karen Gillan has said that the audience may gain more sympathy for her after watching Guardians of the Galaxy Vol. 2.