It may have been delayed to Spring 2018 and we haven't heard much about it all this year but that can be forgotten as Rockstar have just dropped this glorious second trailer for Red Dead Redemption 2.
New Story Trailer for Red Dead Redemption 2 Debuts New Outlaw Hero, Spring 2018 Launch | USgamer
New Red Dead Redemption 2 Trailer Released, But No Release Date Announced - GameSpot
http://uk.ign.com/articles/2017/09/28/red-dead-redemption-2-is-a-prequel-story-details-new-protagonist-revealed