Button redesign, the rounding of those sharpish edges, well actually just more ergonomic in general. Also change out the speakers so that the only setting is no longer loud. I have a first run DS so they might have fixed it but if you try to set the sound so that your the only one that can hear it the speakers gets scratchy. Automatic sleeping when you close the shell on GBA games. Just like the DS games. Yeah that would be nice. Online Picto chat be fun.