User blog comment:Saratje/PC release date explained - Skyrim: Dragonborn DLC/@comment-5469467-20121123211511/@comment-89.101.126.37-20121128234002

OK please allow me to clear this up, I have a xbox development kit and I have aquired a beta of this dlc already. The xbox 360 will have 30 day exclusivity however, the actual xbox 360 file is merely a container format, therefore it can be easly extracted. The extracted file will be the same as the file included in the installer for pc.and so will be playable. This was the case for dawngaurd and will be no different with dragonborn.