The folks at Turbine's Lord of the Rings Online have released this new developer journal that talks about instancing in the upcoming Book 14 launch.

There's nothing quite like getting together with a group of friends and challenging yourself to work your way through an instance. Feeling like you're working together with your friends and defeating a difficult foe, and being rewarded well for your efforts, are some of the best experiences you can have in an MMO. Well, this is something we've been looking to enhance in LOTRO and in Book 14 you'll be seeing some significant updates to a number of our high end instances. I'll break down a few of them to give you an idea of what is coming your way.
Read the whole thing here.