You can follow the links from the LotRO forums to get the uTorrent info or other download options. I highly recommend the uTorrent - seems to work faster than the standard updater gizmo included in the game.
The full release notes are also available and include such tidbits as:
- A new area: Eregion where the ring-forges are located.
- Another epic book quest.
- Prelude quests to Moria!
- Upgrades to loot found in several dungeons.
- New character animations.
- Monster play changes.
- Crafting changes, class ability changes and a bunch of other stuff.