ZombiU demo is on the eshop/wiiuware.
Seems like an interesting game. It's one of those games where the controls feel obtuse by design. Three zombies were chasing me and I threw a flare, then wanted to get out my grenade to blast them at once. Switch to touch screen to open backpack inventory, tap grenade hoping to equip it, and it gives me a description of the grenade. Had to drag the grade from my backpack to my handheld inventory, then switch to the grenade once I've left that menu, then prep to the grenade, and finally throw it--at this point the zombies all just went their separates ways and I ended up wasting the grenade. It made the situation tense, so mission accomplished? What felt unintentionally crummy was when the tablet would drop my swipe/drag motions.
And a slight quirk with having the right stick up top is that my view goes downward when I only wanted to turn. I guess over a decade of muscle memory does that.