Star Wars Episode 7 The Force Awakens | Will Darth Plagueis be the Sith Master?

Speculation that actor Andy Serkis using motion capture for his role in Star Wars Episode 7, may play the Sith Lord Darth Plagueis. Perhaps even Darth Bane. Who will be the main villain in episode 7 pulling the strings and master to Kylo Ren? Discuss!