Brimstone Sands has leaked quite a while back but everyone assumed it would just be another endgame map without much life in it. The latest leaks, however, point to a more lively map.
New World has quite a few biomes that were stuck on a relatively small island - from lush green forests, beaches and valleys to snowcapped mountains and hellish landscapes that resemble a volcano's immediate surroundings. One thing AGS didn't cover yet is a desert biome but that will be done in a future update.
Namely, the Brimstone Sands map is the next zone we're getting but due to its proximity to Great Cleave and Shattered Mountain, many just assumed it would be another one of those zones that can't be captured by a company.
This will not be the case apparently, with eagle-eyed fans having spotted a fort and war camp on the map of the region, which became visible on the current PTR cycle. Whether the visibility was intended by AGS remains to be seen as it wouldn't be outside the realm of possibility to tease the new content this way.
Brimstone Sands borders with Ebonscale Reach as well so the company that holds one of them will likely have an easier time grabbing the other. After all, it's better to have neighbouring regions under one's control, rather than two on the opposing sides of the map.
There is currently no release date for the new map but New World does have a lot of exciting changes on PTR, such as the removal of the dungeon keys, decreasing the grind for crafting and more.