Again from Joystiq:
The upcoming apocalyptic Bethesda sequel will come with an extra treat for Microsoft fans. Both the Xbox 360 and Games for Windows versions will feature DLC that’s exclusive from any other version. (That’s the PS3, if you couldn’t figure it out.) “I just wanted to say how much we love XBLM … we’ll be doing substantial exclusive 360 and Games For Windows downloadable content,” said executive producer Todd Howard at the Microsoft E3 keynote today.