In that preview we wrote of a "crisp and clear presentation" along with a "buttery smooth" framerate, but the key questions of the actual native resolution, in particular, are best left to those with the relevant analytical tools. Something may look clear enough to be native 1080p, but we didn't want to bet the metaphorical house on it.
Well, pleasingly - and as expected as this is a remake - the upcoming Wii U release is running at a native 1080p, as confirmed by Digital Foundry. That's actually relatively rare on the Wii U; for example Super Mario 3D World runs at a native 720p but upscales to 1080p, and a lot of titles on the system do that. Twilight Princess HD joins a relatively elite club, then, with Super Smash Bros. for Wii U being another title notable for its native 1080p output.
The framerate, though, is locked at 30fps (unlike the brawling title in which the main play is 60fps, while backgrounds and assist characters are 30fps). That's the same as The Legend of Zelda: The Wind Waker HD, though in our opinion Twilight Princess HD is a more solid performer throughout the adventure. Digital Foundry pinpoints some minor drops, but for the most part we reckon the new remaster hits its mark more consistently than the Wii U's other HD Zelda title.
In any case, you can see the brief video from Digital Foundry below, and no doubt the team will follow up with a more detailed analysis soon.