Hawkman and Starhawk
I had hoped that Starhawk might joining the cast in Guardians of the Galaxy Vol. 2, but alas, that does not seem to be the case.  Maybe  Marvel doesn't want to confuse audiences with two "star" heroes in the mix - I hope not because Starhawk was always cool in the old Guardians of the Galaxy comics, and I'd love to see him make the leap to the big screen.