Apophis2036
Banned
It's really more a question of features. Is the Wii U GPU not capable of handling, managing, calculating, understanding and rendering it on screen, visual things required for next gen engines, that PS420 GPU will.
I would be less concerned by the raw capacities of the chip. As an example (with flaws but you get my point) entry-budgeted RV515/RV530 based cards can run A LOT of recent pc games with directx 9 setting at a good resolution with reasonable graphical options, from my experience.
The cheap Redwood cards can handle directx 11 games rather well also.
Whatever the GPU chip is, if it can handle CryEngine 3, Unreal Engine 4 and DX 11 features then at least Wii U will get next gen third party games, even if they have to be scaled down a bit.
The lack of Crysis 3 on the system is a big concern for me (i know some people on here think it's just a business decision, even tho EA pledged huge support for Wii U at E3 2011), if it can't handle this gens multi platform games then i don't know how they expect it to handle next gen multi platfrom games.