Vanity Fair ran a photo of the actor playing Kylo Ren (media.vanityfair.com) earlier this year. If you look the brief shot of Ren approaching Finn in the most recent domestic trailer, he's not wearing his mask and hood, and you can see his hair.
Love seeing Action Chewbacca.
(edited by Matt Tracker on 6.11.15 1254) "To be the man, you gotta beat demands." -- The Lovely Mrs. Tracker