According to a new post in answer to player questions about deploying the Elder Scrolls Online Update 6, Zenimax has indicated that it is shooting for the last week in February to bring the massive patch into the game.
Players have been taking advantage of Update 6's presence on the public test server in order to check out the feature enhancements, item store, updates and additions
Check out bcbully's thread right here at MMORPG.com.
Source: ESO forum