Hela: of Mice & Magic arrives on PC, PlayStation 5, Xbox Series X|S and Nintendo Switch 2 on the same day. The PC release runs through Steam, the Epic Games Store and the Xbox PC app. On Xbox the game is a day-one Game Pass title, which means subscribers on Series X|S and on PC can play at launch without buying a copy.
The platform split matters more than usual here because the physical edition does not exist everywhere. The Harmony Edition covers PS5, Xbox Series X and Switch 2. Xbox Series S is digital only, and so is every PC storefront — there is no disc for Windows.
What is not on the list
No PlayStation 4 version and no Xbox One version appear in the announcement. The current-generation consoles are the only ones named, and the Switch release is Switch 2 specifically, not the original Switch.
Crossplay is the open question. Four-player online co-op runs through Epic Online Services, but nothing in the publisher's material states whether a PlayStation player can join an Xbox host. Treat it as unannounced rather than absent.