Lord of the Rings Online's Book 13 patch was Forochel. The fact that Forochel has an enormous water mass (that players can't swim across) makes it perfect for the new fishing mechanic being introduced to the game. If players aren't in the mood for fishing, it's not as though they can't level up on their own instead. Forochel is very solo-friendly.
There's also been the recent revelation that Book 13 will have a pretty cool name, "Doom of the Last-King" and will be the first zone in LotRO to have it's own faction reputation to earn. So expect to be at an 'unfriendly' status with the Lossoth in the region, at least upon first entering. Improving your faction level with said survivors of the Forodwaith will be rewarded with treasures such as new armor sets, a new mount, weapons, housing decorations, and some class-specific items as well. All very cool stuff, but there's still some more to be seen.
Today Turbine has released some rather enticing new screens for the upcoming Book 13 patch and we've got them right here for your visual enjoyment.