All games on SD cards, no memory cards needed since they're SD cards with space for the savegames. A demo cart in the same ilk as Metroid Prime Hunters on the DS, with Tennis, Cooking and Fishing.
Ships with two Wii controllers, white and black.
Wireless built-in so DSes can communicate with it and connect to the online service without the PC adapter or a router.
The ability to plug in three or four Wii carts (under the flap), boot the console up without having to switch carts, and just select the game you want to play.
Tennis is free with the console.