As I mentioned in the thread you posted on the other site, Cap, while I agree that anything could happen, especially after the megaton announcement of DQ IX on the DS, I think the games could be either original IPs or sequels to lesser known games.
I think the Front Mission theory works well. I actually believe that it could be expansions to FFXI 360, but considering the game flopped on the 360 I doubt it.
BTW, wasn't there an original MMORPG in the works for the 360?