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Okay, without a doubt, it's a Wii U title. I'm a graphic designer, and the shading on the models in that teaser looks just like the shading that all of the Wii U Dev Kits come standard with. Look at the shading on that last scene, and then look at Early screenshots of Wind Waker HD, or the new Smash Brothers. Heavy light making bloom, soft shadows fading into heavy shadows, giving everything a -polished-but-plastic-looking feel. As in, everything looks like a moving action figure made with a glossy finish.
This screenshot fits that so exactly. I mean, compare its shading to the shading in this screenshot. (I tried to find a screenshot with the celshading not present, so sorry for the lack of hard light, but look at other screenshots with it on. The hard light reacts the same as in OP's screenshot.)
