AKA Skyrim meets The Sims (let the terrible puns begin). As the title says, this is an add-on, not a major expansion a la Dawnguard so don't go expecting a flood of content to drown yourself in. The focus of Hearthfire is the new ability to create your own home after purchasing land, but in addition to that you can expect additional features such as child adoption with basic parenting, gardening, and so on. It'll be available for download on XBL next Tuesday for 400 MSP.