User blog comment:MegaScience/Minerva's Den coming May 31st, 2011 for PC/@comment-1313447-20110519065122/@comment-1313447-20110519210057

I thought that as well, but it seems a number of expansions that come out today have their own content, even if it is redundant from the parent game. I guess you will be able to find out once you have "acquired" Minerva's Den. I look forward to seeing what you find.