User blog comment:TW6464/Omega has been Confirmed!/@comment-3046679-20120922004944/@comment-1958269-20120923053239

Sorry, but that's highly unlikely. Content as intertwined with the main game as an additional party member is usually developed alongside it. That's pretty much been the norm for the rest of the BioWare DLC gang (Zaeed, Kasumi, Javik, Shale, Sebastian).