They once had specific stats, but then it became too complex once others were added so I just left them as "coming soon". Note that they have been that way for years now.
And yes. Soma was in charge of making them, but only got done some of the weeks. IF you want to help they work like this.
Step 1: Find a biome that needs a map.
Step 2: Find out what was the first week it appeared.
Step 3: Take the map from the first week it appeared and color its biome red.
Step 4: Upload it to the wiki in the appropriate location for it to show up.
Here is an example ...Global Glacier
3. All the ice would become red.