ESO has been given an M rating from the ESRB. The Elder Scrolls Online’s twitter account linked to this image and post:
Fans of this game, fear not! It looks like Bethesda has your best interest at at heart, creating the game they want their fans to be able to play.
Elder Scrolls Online releases on PC and Mac on April 4, 2014 and on PS4 and Xbox One in June 2014.