Update: The update has been delayed and is now set to release on April 12th.

Today on his weekly stream, Frelorn announced Update 18 is to release on April 11th. The update will include the Battle at Pelennor Fields instances and story, the Far Anórien region, a level cap increase and a variety of improvements to the game.

More info on Update 18:

Update 18 Preview Videos

Update 18.2 Raid Info