-Hybrid OS, unified library.
-Backwards compatibility (with WiiU at least, and with Wii if they can).
-A good Virtual Console from the start.
-An option for a GCube controller that works with PC too.
Easy to program has to be a must.If they can make the thing with enough power to attract 3rd parties, good for them, but they shouldn't compromise their vision unless they are certain of their help.