User blog comment:CrimsonShogun/Omega DLC (and Nyreen!)/@comment-5521671-20121108031602/@comment-5521671-20121108034021

"Omega is not a hub players will be able to revisit once the DLC is complete. " No hub, too bad. But according to the article there are lots of new areas.

Some people datamined Leviathan files and found some references to Omega and something called Citadel. And since Omega became a DLC people started to theorize this Citadel reference is another DLC too.