Wizard of the Coast announced the new set for Fall 2014. The name of the set is "Khans of Tarkir" and is a warn torn world, which also happens to be the home world of Sarkhan Vol - the Planeswalker from "Shards of Alara".
See the complete Arcana post and the announcement video with Mark Rosewater, the lead designer, here
New Set Announcement
Posted on Monday, May 19, 2014