User blog comment:Deshiba/Season 3 Armor and Armor Penetration/@comment-46.40.121.12-20121110203031/@comment-4022742-20121110204801

Ask riot. It's what their post said here: http://eune.leagueoflegends.com/board/showthread.php?p=4857864

I just did some math from the numbers they provided. They might still change it though so don't hold your breath too much ;)