Developer Turbine has announced that Lord of the Rings Online Update 13, The Breaking of Isengard, will be releasing soon.
Here is what the developer had to say,
The epic story continues as you are asked to visit Isengard and Fangorn Forest. While the battles were fought in Rohan, other struggles persisted in the rest of the world. Nature has emerged to reclaim the land ravaged by Isengard. You must play your part in helping to restore order, heal the land, and further vanquish evil in the world of Middle-earth.
We’ll let you know as more information becomes available.