Mark Hamill revealed the news on his Twitter.
— Mark Hamill (@HamillHimself) July 2, 2016
I’m really looking forward to this Star Wars movie in particular, because Rian Johnson is directing. He can bring something to Star Wars that we’ve never seen. Are you looking forward to Episode 8 the most out of the announced Star Wars films or one of the other ones?
Star Wars: Episode 8 Hits Theaters December 15, 2017.