2-The map is set to be the size of GTA V & RDR2 combined
I would call BS on that, i would think they would not spend as much time to make one of the biggest maps out there with so much assets etc. and the detail would need to be huge witch means loads more work for nothing. And as many leaks that are "true" Witch i think is debatable say the map would be big but not that big and they will focus more on MP.