When the EU West servers recently came back up, a keen summoner noticed something a little different when he went to participate in a game.
No official word on this yet, but keep your eyes peeled. This could just be a fluke, but we have known Riot planned to implement this feature for a while now.
Note: This only showed on the EU West server and has since been taken down. It was never enabled for play, only visiable on the selection screen.
EDIT: Confirmed by this red post.