Pre-purchase: You will be charged the full price immediately for this pre-purchase. Xbox One game expected to release on March 11th, 2014. You may download the game from Xbox Live before then, but it will not be playable until after 12:01 AM PST o
https://store.xbox.com/en-US/Xbox-One/Games/Titanfall/8ef9f044-dab7-49f9-9ec6-0aa4c1686efe
game size is 15GB
edit: i assume it should be ready after the march os update since there is no buy button yet