A user has posted this on the steam forums, but I can't find the source for it:
According to the recent QuakeCon announcement, Wolfenstein should return to steam along with Quake Wars before Quakecon 2013 in August. These titles were pulled because Activision is no longer the publisher. Bethesda/id purchased the rights to these and is now the publisher.
They are probably the same version. But who is going to buy the Windows 8 version? Or the phone one??? They should just release the game on Steam if they want to make money. It’s Windows Vista time all over again!