Short term (once its implemented, its an unusable prototype right now), there would be character generation options to spawn somewhere in Mass instead of the current pseudo- new england area.
Thats the only part of it thats really concrete right now.
Once you leave the bounds of Mass it would go back to procedural generation.
There might be future imports of other data, either importing other areas in a similarly high resolution (Alaska and Denmark have been called out as having good data available) , or importing areas in a lower resolution, such as y importing just the highway system and city locations rather than all if the detailed land use data.