As well as a general re-jig of the rules, they’ve got something the D&D Insider. It’s a whole mass of online content that runs alongside of the real world books - digital copies of your books, the venerable Dungeon and Dragon moving from print to Online and so on. Most relevantly, a load of integrated tools to make D&D running easier. Character generators and similar. But, most rrelevantly, a virtual tabletop which you can push your figures around, run your dungeons (Or sophisticated castle diplomacy-rooms if you’re one of those people who actually role-play), SimPolyhedral Die, fully integrated voice-chat and generally everything you need to play the bloody game.
