The Steam page for Sid Meier's Civilization: Beyond Earth now offers the playable demo for the just-released turn-based strategy game. Details on the demo are not provided, so here's the overview of the game itself:

Sid Meier’s Civilization: Beyond Earth is a new science-fiction-themed entry into the award winning Civilization series. As part of an expedition sent to find a home beyond Earth, lead your people into a new frontier, explore and colonize an alien planet and create a new civilization in space.