But a remake of Twilight Princess would have been pointless. It was already 16:9, and the graphical upgrade wouldn't have been that noticeable, certainly not enough to warrant a remake.
Wind Waker's change is far more striking, particularly on land and to get it in 16:9 is fantastic. Plus a lot of people probably played TP on the Wii (unlike WW on the GC) and could just pop the disc into their Wii U. And as for Majora's Mask, it'd be a waste of resources upscaling it to HD when they can just get Grezzo to do it for the 3DS down the line.