i think Smash (as a hold over for Smash 5) Zelda (i get the feeling its best for the game to come WIi U first then later on to the NX cause knowing the budgets of open world games it could really benefit itself for being on both systems), and possibly Xenoblade X (same logic applies to this as i did with Zelda) will be the only one's remaster for the NX
Mario Kart on the other hand i can see any money and development resources that they use to remaster would just go towards Mario Kart 9 instead.