Punished_Snake: Of course yes, just wait a bit untile they've milked the Steam version.
Dzsono: Is that the fashionable thing to do now? Let Steam handle the release and then open up to other platforms afterwards? Maybe it has something to do with preventing day one piracy (even though Steam is cracked in minutes...).
steam is still the most "visible" platform for gamers in the eyes of developers, everyone wants to sell there (other services usually have to ask to be able to sell their games)
and partly the anti-piracy too, but that is just plain stupid as you might have guessed :)