It was just announced at PaizoCon this weekend! From Paizo’s website:
Next August, Paizo will be releasing the Starfinder Roleplaying Game—a new science fantasy RPG based on the Pathfinder universe and rules, but complete and standalone. It’ll be backward compatible, so you can still use all those Pathfinder RPG bestiaries, but will feature all sorts of new classes, races, equipment, and other elements uniquely suited to our far-future setting. You want to play a lashunta technomancer using magic to hack the defense grid, or an android assassin with a laser rifle, or a ysoki ratfolk mechanic clambering around the guts of a spaceship as you blast your way through the enemy blockade? This is the place for it. There will also be new races you’ve never seen before, new worlds beyond Golarion’s system that we’ve never visited, new twists on magic and the rules system itself—and, of course, ton and tons of cool science fantasy gear, from starships and computers to infinitely sharp zero-edge swords and rune-augmented plasma cannons.
It doesn’t come out until August 2017, however. Patience, young padwans.