The Gold Saucer itself will be out later, as part of patch 2.51. In addition to Triple Triad, it will also feature Chocobo racing. Hopefully it won't have that goddamn snowboarding mini-game.
Both the updates will set the game up for Heavensward; FFXIV's first expansion.
For a run-down of 2.5's new features, check out the video below.