The way I am hearing it on other Discords from players is supposedly they are moving the existing maps to the new server were you can plan you existing characters. However the new 4X map will be for new characters only and you will not be able to transfer to this server.
I guess that makes sense, for those that want a fresh start and fresh chance at survival you can play on the new 4x map, this way you will get new people coming into the game and for those who have invested in their character you still have your map.
That way everyone is happy.....seems like a good decision Bitbox