As far as I know, The OC is pretty much dead. Everyone has gone off their separate ways. Ben McKenzie has a new 表示する (Southland) that's pretty 人気 over here. So unfortunately, I don't think there will be any type of reunion.
I understand some ppl didnt like Marissa but she wasnt just 'an annoying extra' she was 1 of the main 4 characters. Ryan was 1 of the other main characters 2 tho