John Boyega played Moses in Attack The Block and it's about time he got part in something really big.
Andy Serkis is known for his amazing mo-cap work - he has played Golem in all the Lord of the Rings films, King Kong is Jackon's version, Caeser in the Planet of the Apes prologues.
Domhnall Gleeson is an irish actor whom has had a lot of small parts including one the Weasley brothers in the Harry Potter series. He was recently Levin in Ana Karenina and was great in it.
Daisy Ridley thus far has only had small roles in several BBC shows.