First, the Xbox Live Arcade screen is changed to have an Xbox Live arcade image for its loading screen. All the icons are also wider, and look more polished than before. The Games screen has a "Launchpad" option where you can play demos and XNA games if you're signed up for XNA. Then the Xbox Live Marketplace gets a very long-overdue makeover to separate the Games, Media, Demos and Gamer Pics from each other. Right now they're all mixed together which makes for a real clumsy and fugly experience in the marketplace.