Pirates is exactly what the title would imply: you are Alonzo Batilia, a ship captain in the Caribbean. It is your job to manage the ship's crew, fight real-time naval battles, upgrade your ship's weaponry, acquire perks, hunt for treasure, and gather new achievements. Assassin's Creed will also be targeting "high-end mobile devices", because the graphics are expected to be quite good as you're traveling from island to island.
Best of all, we're only about one week away from the game being released. Assassin's Creed: Pirates is planned for launch on December 5th, and it will cost $4.99 on both Android and iOS.