Fox is cute.
But here is the fan made map as of Sep 26th, 2018. This is what the map makers at GTA Forums think they know of the Red Dead II world so far based on video and screens. Again, they were nearly 100% accurate when GTA V released, and there were no surprises left after their thorough work.
This particular map leaves out New Austin and parts of West Elizabeth which are confirmed for the game.
FULL SIZE