Eh, anyone that was expecting something better kinda deserves to be dissapointed in this instance. Pretty sure that a Twilight Princess 3D would've been a much better choice to make when it came to porting an already kinda ugly GameCube game.

So... not free. You have to buy a copy of Twilight Princess. And unless I'm mistaken, you also have to own the hardware, in order to legally have access to the necessary system files, etc. And then there are possible legal issues around the reverse engineering necessary for the mods, I believe.

Plus, as I've said before, the mere fact that the game will have Amiibo functionality indicates that some changes have been made to the game. It's likely that there are tweaks throughout the game to improve it. There will almost certainly be a special mode akin to Hero Mode, and I'm betting that there are all sorts of references to Zelda U thrown into the game, too. But if the only thing you care about is having high-quality textures and some fiddly lighting, then sure, buy a high-powered PC, a Wii, a copy of Twilight Princess, and get the Dolphin emulator, download the mods, and play a buggy version of the original version of Twilight Princess with fancy textures.

Dolphin runs on computer, and that is definitely stronger/more powerful than the Wii U

If you look at the grass textures (not the grass itself), they do look similar