So GTAForums guys dug something interesting up. Turns out about a year ago there was a thread on reddit about the leaked map and a user named "reddeadinsider" dropped some info but nobody really believed him so he deleted his account.
Funny thing is digging up his info and well..either he was legit or extremly lucky with the details matching up. Below is his post that I cleaned up a bit and if true, be warned for spoilers...
Lets see what I remember...
You play a gang leader named Arthur. The biggest change made to the game is you have a posse. If I remember correctly, the story kind of starts when you find out someone in your outlaw gang is a pinkerton spy. The pinkertons end up having you on the run through most of the game. You acquire lots of members of your gang such as John Marston, Abigail, little Jack, and others. The core mechanic of the game is having to maintain and continuously move your outlaw camp. When you go on a mission you will choose who to take with you, similar to mass effect or dragon age. The game spans five zones. A directive they keep getting is to make the environments more interactive like skyrim. Whatever that means.
*POTENTIAL END GAME STUFF*
There is kind of a game plus like like the last one had. You end up at Beechers Hope and switch control to John Marston. There are then lots of quests etc dealing with building up your ranch. You literally will do x And Z to build a gazebo. I heard someone designed a mini game where you help a mare give birth that had people laughing.
The last I heard, which was a few months ago, the game was kind of stuck in development hell of sorts. Then team kept remaking a vertical slice demo for the leaders of rockstar and they aren't impressed... They didn't find it different enough or innovative enough. Hopefully they got out of that rut.
I've also heard that since gta5 morale at rockstar SD had been bad. Long timers are quitting. Lots of turnover. Lots of frustration.
That's all I can remember off hand.
A link to where some of his comments turned up.
Man, I mean I don't know. The fact he got the main protagonists name right and the idea of the Pinkertons chasing you along with the dialog heard about the gang being chased over 3 states...maybe some of it was true?