Konami have released the first data pack for PES 2012. When you next load up PES 2012, you will be prompted to start your download, by heading into the Extra Content section of the game.
The DLC has updated the kits of 29 clubs, including the strips of Real Madrid, Sporting Lisbon and Bayer 04 Leverkusen. 13 new boots have been added to the current stock and some players have had their faces updated too.
12/10 - UPDATE: The DLC is now available on Xbox 360. To start your download, simply head to the Extra Content section, where you'll be prompted to upgrade to the latest data pack.