If Nintendo repeats the Wii hardware strategy ...

[Soundwave]

Why doesn't Nintendo just take a page from the hardware designs of the Famicom (NES), Super Famicom (SNES), N64, and even GameCube?

Add an Expansion Slot on rear of the Wii U, with a AMD style CrossFire port that leads to the main motherboard (should be no problem for AMD as this is pretty much standard for them).

When late 2014 rolls around and devs are actually starting to get the hang of "Next Gen" processing (provided they don't go bankrupt) first and if it's shown the PS4/720 are actually impacting Wii U sales/developers are fleeing ... release a processor upgrade for $70-$80 (be nice Nintendo, sell it for cost at first to make it easy to upgrade, as months go on it'll drop in manufacturing cost like all chipsets do and you can cash in then). Hell, include a short game with it with some fancy graphics.

By late 2014, small GPUs will smoke the 6670 even (the GPU reportedly powering the 720 and similar to the one in the PS4) for dirt cheap, so this wouldn't have to be some bulky add-on, it could be something small slides underneath the Wii U, like the GBA Player on the GameCube (added about 2 inches to the thickness).

So if you're a casual Wii U player who's just having fun with Nintendo games + party games ... you can just ignore this, but if you're that hardcore player that wants the same games the PS4/720 are getting + Wii U software ... well for $70-$80 more, you could get that without having to pay $400 for another platform.