The Disney Parks Blog officially announced that Mark Hamill will be appearing at this year's Star Wars Weekends. Hamill is best known for his role as Luke Skywalker in the original Star Wars trilogy and it is expected that he will join the cast of Episode VII.
Per the blog:
Hamill will be one of the celebrity guests for Weekend IV, June 6-8, 2014. Fans can see him in the daily “Legends of the Force” Star Wars-themed motorcade and in a featured talk show.