During the dev chat last night, a link to a map of the new area to be explored in Book 13 was revealed:

A couple of comments from the developers;

- You'll be able to do some ice fishing, along the shore at least.

- And there are a number of routes around the Bay of Forochel, so hopefully you will find getting around it a bit easier than Lake Evendim.

- It's level 44-50 content. Mostly solo as well.

Plenty to look forward to, it appears!