Not at my sharpest today, tired from work... XD

@GoldMetalSonic Since FRN we use 4-8k textures. Means hyper real graphics but 16x storage. Happy this is no prob on WiiU eShop :)

— Shin'en Multimedia (@ShinenGames) November 19, 2013

It says nothing about art of balance using 4 - 8k textures ... 

What is "Since FRN we use 4 - 8K textures" supposed to mean ? Is it every game AFTER FRN releases that every game will have 4 - 8K textures or is it since the announcement of FRN that every game is using 4 - 8K textures ? 

FRN started production long before Art of Balance Wii U, so when they say they're using 4k-8k textures "since FRN" they are clearly referring to AoB; it's the only other game they're making that could do so. If it was only FRN they would have said "for FRN we use 4k-8k textures".

I guess that's a plausible reference ...

I thought Nintendo has just confirmed on e-shop that MK8 is actually 720P 60fps (1-2 player),
or 720P 30fps (more than 2 players local),kinda curious on how Eurogamer did their calculation this time.

http://t011.org/game/80024.html

But that's absolutely wrong. If the hardware is good, then graphics can be cutting edge.

"Good hardware" and "cutting edge graphics", the PS4/XBone do not have the graphical capabilities or performance capabilities of a PC (not by a long shot), so all consoles are garbage in a strict by definition objective look at cutting edge graphics, good hardware, and performance. 

Mario Kart 8 graphics are great.
I have no idea if the Wii U is capable for more then that.
Either way Mario kart 8 looks like a great game.

And Mario Kart 8 also should sell a lot of copies.
It would give Nintendo a big boost in sales.

It almost certainly is, simply due to the fact that it's still too early in the system's lifespan for it to be maxed out.