According to Geek.com, Guardians of The Galaxy Vol. 2 will have Star Lord recruit some new members into the Guardians and we now know who that is. The new members include Yondu, Mantis, and Nebula.
The surprising character is Nebula and it will be interesting to see how she factors into the team including with The rivaly between her and Gamora.
Source:Geek.com