Specifically, it'll be available for Xbox Series X, Xbox Series S and Windows PC.
You can check out the reveal trailer up above, along with some more details below.
"33 Immortals is a co-op action-roguelike for 33 players. Play a damned soul, and rebel against God's final judgement. Dive straight into epic 33-player co-op battles with instant “pick-up and raid” matchmaking. Cooperate with your allies to survive against hordes of monsters and massive, challenging bosses. Expand your arsenal and equip powerful new relics to permanently upgrade your soul. Face the wrath of God in a fight for your eternal life."