Been playing the game for some good hours. The improvement is much, much better than first expected. It actually renders it 'playabe' now 
Here we posted a face to face SD vs HD face-to-face gameplay comparison video:
http://www.gamereactor.es/noticias/...+comparativa+Wii+U+HD+vs.+Wii+SD+cara+a+cara/
Here we took 50 HD screens and preview:
http://www.gamereactor.es/avances/278193/The+Legend+of+Zelda+Twilight+Princess+HD+-+impresiones/
(will update with English asap)
Guess there'll be plenty of previews and stuff coming up now. But just ask me if in doubt!
EDIT:
English preview available.
And two hours livestream replay (Kakariko - Eldin Bridge fight - Ordon - Death Mountain trail - Goron Mines dungeon with Iron Boots until mid-boss and Hero Bow).
Here we posted a face to face SD vs HD face-to-face gameplay comparison video:
http://www.gamereactor.es/noticias/...+comparativa+Wii+U+HD+vs.+Wii+SD+cara+a+cara/
Here we took 50 HD screens and preview:
http://www.gamereactor.es/avances/278193/The+Legend+of+Zelda+Twilight+Princess+HD+-+impresiones/
(will update with English asap)
Guess there'll be plenty of previews and stuff coming up now. But just ask me if in doubt!
EDIT:
English preview available.
And two hours livestream replay (Kakariko - Eldin Bridge fight - Ordon - Death Mountain trail - Goron Mines dungeon with Iron Boots until mid-boss and Hero Bow).