Well we at least know it's in-game, running on Wii U... So even if it is a cutscene, the AA still counts, right?
There's also been a few 1080p screenshots released, but a few skepticists claim it's impossible to pull off on Wii U due to a near complete lack of aliasing. Nintendo hasn't been releasing fake screens for previous Wii U titles, but nobody knows if these are legit at this point.
There are no jaggies in those shots, which means they were captured at a higher resolution and downsampled (bullshots). I'd be surprised if the final game ran at more than 720p/30fps.