One of our most anticipated titles of 2017 has now been pushed to 2018. This isn’t massively surprising as Rockstar traditionally only releases their titles when they believe they are fully ready. With RDR2 likely having a massive scope, and with Pro and Scorpio support to think about as well, they likely needed another 6-8 months to fully finish the game properly.
You can find the official announcement from Rockstar here : Rockstar RDR2 Announcement
In the meantime, Rockstar did provide some new, gorgeous images from the game to make the wait even more difficult!