That actually looks really cool!
There's still some questions I want answered, like the battery life, of if the device will have a touch screen (it wasn't implied in this trailer), but that sure has a good presentation.
I'm so glad they didn't follow with the Wii name brand, and I like it has so many ways to be played, but it can also be played classic style with just a controller and a TV screen, so it doesn't feel like like they're forcing players into playing their way, like the Wii and Wii U.

It seems that Nintendo is really learning from their mistakes now