Ritual can't have it both ways. Either the game is playable as shipped or it isn't. If it is, it could and should be playable via Steam right now.
It's a fucked up way to publish a game at retail since the game isn't playable as shipped, but that's Steam for you.
It's Dystopia. Go check their page, they have the Source logo on the videos, along with the Steam logo. Someone else mentioned it already, not sure why there's still discussion :\