Epic has officially lifted the lid on Infinity Blade, the first iPhone game to run on the Unreal Engine. This is the project previously known as “Project Sword”, a tech demo of which was released on the app store entitled “Epic Citadel”. It’s currently in development over at Chair Entertainment, the team that brought us Shadow Complex on the Xbox Live Arcade. They’ve been working on the game for about four months, and a release date is yet to be confirmed. However, we do know that it will be exclusive to the iPhone 3GS, iPhone 4 and iPad.