Lol, people think this game is technically impressive? It would be better to make a thread wondering how MK8 is running at 60, because that's genuinely surprising for the WiiU.
Splatoon is literally just up-resed Mario Sunshine code with better lighting and textures. It would be a scandal if the game weren't running at 60 fps. The Game Cube basically could run this game with some downgrades.
What's impressive about Splatoon and other Nintendo games, is the way code is recycled. Nintendo has be using the Mario 64 codebase and OoT (modified Mario 64 code) codebase since those games came out. They seldom re-write code, they merely build ontop of it. Some camera movement in their games predate even the N64- originating on the never released Starfox 2 according to former employees of Argonaut. Splatoon just applies Mario 64 collision code, Sunshine's paint code, and adds a squid mechanic. They probably had a rough prototype ready within a couple of weeks of starting development. Ever wondered why the dev. team for Splatoon seems so small? There's your answer.
I was actually disappointed with the way Splatoon looks. It could use better art direction in my opinion, but hopefully this is prior to Nintendo's graphics wizards getting their hands on the game. Captain Toad's graphics and art direction destroy this game.
Finally, I hope Splatoon (and I guess Captain Toad?) are harbingers of a new paradigm at Nintendo. Nintendo shpuld be able to output games relatively quickly with as many people as it employs. Most "indie" dev teams are smaller than 10 people, and put out amazing work without Nintendo's code library to help them. Hopefully Splatoon sells well (it's Q1 2015, I'd catch the post-Christmas rush), and encourages Nintendo to break it's younger developers into smaller, nimbler teams. Nintendo's young guns can have great ideas when they're left to their own devices it seems.