I would like to see the game preview window become more animated then a simple bounce effect after you've selected it. Either a short looping preview of gameplay or an animated logo similar to what you would see back on the Wii main menu would be ideal.
Secondly, a nice selection of different Atari remixed songs based on which section of the menu you are in would be nice along with better menu sound effects (there must be some 2600/ST/Jaguar sounds that could be used that invoke Nostalgia). It would also be nice if it could also be muted or the music be changed for something custom in your library if you don't like the presets.
Last of all, I would love some kind of global chat/discord integration right into the console menu (think StarCraft 2 chat) to help grow the community on the device itself. Oh and a music player/visualization app would be great ?