Oh, I'm holding it. There's no other reason they wouldn't have spec'd the Wii U to automatically upscale Wii games the same way the 360 and PS3 do with last gen games. Wii HD editions incoming.
We already know Wii U upscales Wii games and we also know why it doesn't uprender or add any filters.
Hint: it's for technical reasons.
I have said this a million times... there are a lot of great things in this game. The hand holding is absolutely out of control though. There is not one instance were the game actually lets you discover anything (played to about the third dungeon... after the ship part). I simply cannot play a game were the game constant feels the needs to remind me of my goal, mention obvious clues and just take control away just when I'm starting to have fun.
I recall someone posting their ideas for a next gen Zelda game... something that right after a brief introduction just trust you into the world without holding your hand from that point on (sounded a bit like dark Souls). That's what this series needs. Not more of this bull shit.
This is, as usual, a gigantic exaggeration. Hand holding is the biggest problem the game has in my opinion, but inside the dungeons they very, very, very rarely they tell you anything. Especially as you progress.
It's outside the dungeons that they point out things, ridiculously obvious things, but they point them out nonetheless, probably in the hopes that they were guiding unexperienced players to do the basic things so that they could do them by themselves when the harder puzzles come in the dungeons.