did rotating queue not happen this week?

You can still access RGM on the old client. if you can't find it http://boards.na.leagueoflegends.com/en/c/miscellaneous/aVEbnVrz-cant-stand-the-new-client-have-no-fear

If you're currently playing on the new client, they have not implemented the ability to play in the rotating game mode queue. If you want to play this weeks game mode, One for All, you'll have to use the legacy client.