The new antagonist is Kylo Ren, not Luke. http://www.theverge.com/2015/4/16/8431709/star-wars-episode-vii-promo-art-kylo-ren http://www.ign.com/articles/2015/04...d-lightsaber-from-star-wars-the-force-awakens edit: Technically it could have been Luke if he had just been using that as his Sith Lord name, but this character is being played by a completely different actor. I also don't know who Luke is talking to in this trailer. The assumption is that it's Ridley, who is one of two twins, while Kylo Ren is the other. Funny though how Han and Leia having twins was always part of the EU, which they said they were not going to use as canon, yet there's at least something very releated going on with this film.