User blog comment:Jimeee/Hearthfire confirmed as the latest add-on. Official trailer./@comment-209.33.92.189-20120903030110/@comment-5469467-20120904065541

I think he means the content of Hearthfire is an like an rpg itself. It kind of is if you think about it, especially with building a home from the ground up and raising children yourself. An rpg within an rpg? Rpg-ception.