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League of Legends Mac client now available in Public Beta Environment

League of Legends ' Mac client is now in the Public Beta Environment with an open beta expected to follow soon, Riot Games' Steve "Udyr" Mieczkowski revealed today in a surprise announcement on the League of Legends forums. The Public Beta Environment (PBE) is a place for existing League of Legends players to give feedback and locate problems before new features hit the live servers.

http://www.polygon.com/2013/1/23/3909980/league-of-legends-mac-client-now-available-in-public-beta-environment