At least some work has been done on every area of the game. Some are near-complete, some are only roughly blocked-in, some are even less than that. Our current areas of focus are 233 and Jungle Island, previously we've focused on Prison Island, Temple Island, and K'veer, so those areas are farther along than the rest.
The finished project is still years from completion, but we're making progress every day. Unfortunately, I can't give any more detail than that!