https://www.pcgamer.com/red-dead-redemption-2-will-have-online-multiplayer-like-gta-online/

We don't know yet if Red Dead Redemption 2 will be released for PC: Rockstar has so far only committed itself to the Xbox One and PlayStation 4 platforms. The same holds true for today's announcement of Red Dead Online, "a new online connected experience set against the backdrop of Red Dead Redemption 2." But it's pretty big news, especially given the continued popularity of GTA Online on PC, and so I'm here to tell you about it. 

Red Dead Online is "an evolution of the classic multiplayer experience in the original Red Dead Redemption," Rockstar said, with a narrative framework supporting both competitive and cooperative play. It will be playable solo or in groups, and "constant updates" are promised, "to grow and evolve this experience for all players."