They have just announced on twitter that RDR2 is coming Fall 2017!
Developed by the creators of Grand Theft Auto V and Red Dead Redemption, Red Dead Redemption 2 is an epic tale of life in America’s unforgiving heartland. The game’s vast and atmospheric world will also provide the foundation for a brand new online multiplayer experience. - http://www.rockstargames.com/reddeadredemption2/
Rockstar Announces Red Dead Redemption 2
Falconer / Oct 18, 2016