Lord of the Rings Online players will get to dive into Volume 2 Book 8 for Mines of Moria on June 23.
Turbine has the new content ready for pre-patch, so if you want to download it now to be ready for Tuesday, you can.
Get it through the official website here.
While you are at it, take look at the patch notes through here.
Might want to have a sandwich and a cool beverage on hand. The list of changes is quite long.