I wonder if mario kart will be bundled with the console. Then being a port to switch won't be too big a deal. However if not then it really needs to be upgraded to make use of the greater gpu, cpu power and the extra memory. Moving the engine from ppc to arm code surely means an upgrade here or there in that process.
You have to remember people expect poor underpowered hardware from Nintendo nowadays. If they release a game at launch that looks pretty much the same as the wii u version people will assume the worst about the hardware.
Nintendo need to impress with their games which is much easier to do with cartoon graphics so if the Switch is about 3x wii u performance it needs to show it.








