CVG have an interview with Jeffrey Steefel which touches on the next expansion to the game:

What can we expect to see in the next update?

Steefel: We’re not talking too much about that yet. But I can tell you that, Amarthiel, who is this new character that we’ve introduced, is in search of a powerful ring - that’s a big part of Book 10.

There’s not going to be a new region in Book 10 but the whole city of Annúminas will be opened up, and a lot more things will be happening there. And then there’s some new type of gameplay that players haven’t been able to do yet that they’ll be able to do in Book 10.

Read the rest of the interview HereSource: CVG