According to the Schmoes Know podcast Star Wars: The Force Awakens will have a post credits scene that will tease Star Wars: Rogue One.
Star Wars: Rogue One is directed by Gareth Edwards, and stars Felicity Jones, Diego Luna, Ben Mendelsohn, Donnie Yen (IP Man), Jiang Wen, Forest Whitaker, Mads Mikkelsen of Hannibal fame, Alan Tudyk (as a motion capture character), and Riz Ahmed.
Rogue One tells the story of resistance fighters who have united to steal plans to the dreaded Death Star.
The film will be in theaters on December 16, 2016.
— Schmoes Know (@SchmoesKnow) September 11, 2015