They’ve also stated repeatedly, even when relaying that LoZU will not be part of directs and every mention of the new LoZ is a Wii U title specifically. During the initial development of Twilight Princess, it was always stated to to be a gamecube game and was delayed a year for refinement and to be ported to Wii. So its not something that just happened without warning or came out of nowhere.

Of most interest in all of this is how Nintendo have shown the leaping from horseback mechanic in the previous showings of the progress of the game. Given that Nintendo has been busy updating its catalog of games in HD (where relevant) and that this is a Wii U game that features extensive use of the GP. I guess it kinda means there is going to be GP support with NX. That being the case then one could consider every Wii U game to be available at launch for NX.

In all reality, there is not much Nintendo could do with its Wii U games to make them somehow a differentiating experience by simply upscaling the resolution of the content which they can do without any special porting. They are already in HD with great high res texture work.