It’s unclear at the moment what the regions will be used for and whether or not they will open to the public anytime soon. I guess most likely we will have to wait until the lab announces something about these regions in the near future.
From the map view it looks like the arrival of new Linden homes 2.0 is my guess with water surrounding the central areas. It’s a huge land area and a big Linden project for sure.
The new panels have been enabled, as of today, allowing owners to use the new Linden Home control panel (Next to the door). Linden Homes is still in the Beta period currently and apparently around 13, 000 residents have now got a Linden Home. Jack Linden said that there are now base textures for the many themes available and that there are hub areas where you can find a kiosk of textures.
Linden Homes and Viewer 2 seems to be popular for topics at the moment. This is great progress being made so far for the new Linden Homes project. I’m interested to see what comes in the near future!