Start timing and details of the playtests will be provided at a later date to those who register.
To accompany the news, Bethesda has released a six minute CGI 'Alliances Cinematic Trailer', in which three alliances - the Aldmeri Dominion, Daggerfall Covenant, and Ebonheart Pact - square off for control of The Imperial City.
"We're really excited to get the game into players' hands," said game director Matt Firor. "We receive invaluable feedback through the beta process, and that helps us ensure that the game will be one of the best online gaming experiences ever offered -- one worthy of The Elder Scrolls franchise."
Elder Scrolls Online uses Megaserver technology to deliver "one of the most socially enabled games ever created", featuring one connected world with a built in social network, according to Zenimax Online.
Nick Konkle, lead gameplay and combat designer on Elder Scrolls Online, told CVG the MMO is being designed to be "accessible to anyone".
Bethesda has confirmed an Elder Scrolls Online release date window of 2013 on PC and Mac.