While James Gunn has no problem using the Nova Corps (led by Glenn Close’s Nova Prime) in his Guardians of the Galaxy movies, this isn’t the first time that the director has stated that he isn’t using Nova.
So unless Gunn changes his mind for Guardians of the Galaxy Vol. 3 or someone else takes over directing duties on the threequel, it’s unlikely we’ll ever see Nova hanging around with Gamora, Groot and the rest of the gang.
It’s not that he dislikes the character, it’s because he wants Peter Quill, a.k.a.
Star-Lord, to be the only major human character in the Guardians adventures.