From Screen Rant:
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When asked about casting newcomers for Guardians of the Galaxy 2, Gunn revealed that the process has already sort of begun. He’s already talking with someone about playing the character he has in mind, a new Guardian, as he labels it. We don’t yet know who that is, but in terms of the core Guardians of the Galaxy roster, we’re guessing based on Gunn’s words since the first movie came out, that there will be two additions to the team: someone we’ve met and someone we haven’t who he’s talking to now – even if it’s informal talks at this point.