Lord of the Rings Online is that it has a very definite deadline to contend with. While the story runs in parallel to the events in the books, it also has to line up in terms of what's taking place, which is why players will be parting company with the Grey Company starting in the next installment. Instead, as outlined in a new developer diary, Book 5 of Volume III will see players working with Prince Théodred, heir to Rohan, as he works to organize the defense of his country's borders.
The diary also gives a firm date to mark story progress by; according to the book's timeline, Frodo should reach Mount Doom in about a month. Players will find this book to be a bit shorter than the previous installment, but it should still be a vital component as the game approaches the climax of the trilogy. They'll also receive a cosmetic set of equipment at the beginning of Book 5 to help them look like a Ranger, which is appropriate considering the story progress up to this point.