Well I've held the Switch this morning so I can be actually sure about this really being a cool device now.
For earlier questions, the plus-button is binary, not a D-pad.
In the MK8D-demo you can't view vehicle stats so I couldn't look at the weight of the newcomers (and we played as Lakitu and Yoshi anyway).
The Legend of Zelda is also translated in Dutch for all on-screen texts (voices still English), as announced by Eiji Aonuma in a video.
It is really funny to watch a Japanese person try to talk Dutch (opening and closing greets).
Also the HD Rumble (as highlighted in 1-2 Switch) is absolutely fantastic! Holy *bleep*, one of the highlights today.
Playable today where four 1-2 Switch minigames, Splatoon 2, Mario Kart 8 Deluxe, The Legend of Zelda: Breath of the Wild, Snipperclips and Arms.
There was a photo-booth with Mario using artwork from
Odyssey.
Some pics here.