Today Rockstar announced Red Dead Online, an analogue of Grand Theft Auto Online in the Red Dead Redemption 2 setting. However, unlike GTA Online, RD Online assumes the presence of a storyline.
Red Dead Online is planned for launch in November 2018, initially as a public beta. Access to Red Dead Online will be free to anyone who has a copy of Red Dead Redemption 2, which will be available for PlayStation 4 and Xbox One on October 26, 2018.
As in GTA Online, for RD Online, long-term contents updates are expected. Find out more in IGN’s Q&A here: http://www.ign.com/articles/2018/09/19/red-dead-online-devs-reveal-first-details.