In addition to the earlier rumor about Oscar Isaac, Comic Book Movie also has a video interview between Zac Efron and a British news outlet for his upcoming film Neighbors. In the interview, Efron appears to hint that he has a role in the upcoming film and I sincerely believe that he will be cast in the film. He's fantastic in Neighbors and I do think that it would be a smart move for the studio.
All of these Star Wars rumors are promising. It's clear that producer Kathleen Kennedy, JJ Abrams and Disney's CEO Bob Iger want the best possible actors for these roles. I'm betting that the final cast ends up including Mark Hamill, Carrie Fisher, Harrison Ford, Saoirse Ronan, Zac Efron, Oscar Isaac and Adam Driver. That's just a start and actors like Jesse Plemons and Nyong'o could show up as well. All of it is extremely interesting and I'm intrigued to see how it plays out.