Topic: Any ideas what this mystery game could be?

Skip to 1:57. She's playing a game I don't recognise but I can't tell what it is. Any ideas?
Sorry if it's really obvious or someone has already posted :')

It could be New Super Mario Bros. 2.

I could be wrong but it looks just like that mickey mouse game.

I definitely looks like a platformer, but idk, it doesn't look colourful enough to be Mario :/

I think there's already a thread like this one.

I did have a quick scroll before posting to see if anything similar was posted, but obviously I can't be 100% sure;+ the video in question was only just posted onto Youtube. Whethere it was already on Nintendo's E3 site beforehand I don't know.
Also, I don't think it's Epic Mickey because the HUD in the top left doesn't correspond with the one shown in previous screenshots of the game.

Donkey Kong Country 3D.

There is a secret game that they are announcing at 5pm Pacific time according to IGN's front page

It just looks like Heroes of Ruin or Kingdom Hearts.

nothing new because it was at the booth. nobody reported anything about a new 3DS games

guess it is just the super mario game

The bottom screen has a map of the level, so it's probably either Power of Illusion or Castlevania. It's definitely not Mario though.

Looks too drab for a Disney game; I'd say either Castlevania or Heroes of Ruin.