There's an MMORPG set in the Horizon universe on the way, titled Steel Frontiers. Though it may seem odd to branch a single-player series off into something multiplayer-focused, apparently, this was all part of the original idea from Guerrilla Games for Aloy and the mechanical dinosaurs.
"From the first moment we imagined Horizon, we always thought about it as a multiplayer game," Jan-Bart van Beek, studio director of Guerrilla Games, tweeted following the announcement. "Lego Horizon Adventures was our first small step; with Steel Frontiers, we're taking a bigger one. There is much more to come, and we’re excited to show you what is coming."
