LOTRO Players has put together several videos showcasing the new zones: Central Gondor, Lebennin, and Pelargir. There's also a film of the Pelargir epic battle, which the fansite says is a vast improvement from Helm's Deep: "Retaking Pelargir is the shot in the arm the epic battle system needs. It gives purpose to the system and has a clear and satisfying ending."
You can watch all four videos after the jump.
[Thanks to Joel for the tip!]