Has this been confirmed? I see no post anywhere other than the thread on the EU forums. Surely it will stay in NA as well...
On September 20, 2011, we will be performing scheduled database maintenance starting at 01:00AM Pacific time. The maintenance should last approximately 7 hours. During this downtime, we will continue to upgrade our databases in preparation for League of Legends: Dominion.
Also during this downtime, well be fixing the Elo bug and resetting Season One rank wins/losses. Following the maintenance, rank games will be re-enabled and normal draft will be disabled due to load concerns.
Thank you for your understanding and patience. Enjoy a nights rest from the Fields of Justice and see you online following the maintenance!