To be honest, i wouldn't mind seeing the new console have 2 or 3 choices for control. A new control system in place for what-ever games are to come out for the new console, and the already existing Wii-mote system for the (hopeful) backwards compatibility for all existing Wii software. The 3rd choice is optional, but control ports for the GC/Wavebird. Showing that the new console is not only backwards compatible for the Wii titles, but that GC software is compatible again. If not by disk format, at least on a new and improved Virtual Console.
I say new and improved, but if Nintendo implemented what both the PS-Store and XBL have, which are more free demos to games, themes for the console itself and a more reliable online connection/online play. Which is something that the Wii lacked and needs for it to be able to stand-up to the larger consoles.
I'm hoping that we don't see the existing Wii re-modelled with HD graphics. That to me, isn't a new console and shows lazyness on Nintendos behalf. Something that i'm probably not counting on seeing, and hoping that i don't see. It would be bad for them really.