So, Luke only appeared briefly in the new trailer, it showed him with his hood up with R2. So, do you think there's a story reason for him being mostly absent? Is he in exile? If so then why? Could it be that Kylo Ren was his student, and him turning to the dark side caused him to lose hope and choose not to reform the Jedi Order? What do you think?

I heard a stupid rumor that despite pictures of Adam Driver as Kylo Ren people are saying Kylo is Luke.

http://epicstream.com/features/The-Reasons-Why-Kylo-Ren-Could-Be-Luke-Skywalker-and-Why-Hes-Not

Just ignore it. It makes no sense, remember Ren said he was hunting the last Jedi.