Round-up of the hardware vid key points:
7.9 inch screen
same thickness
1080p/full HD
up to 120 fps
LCD, HDR support
Joy-Con 2 attach magnetically
Bigger SL/SR buttons
Left and Right sticks larger
Mouse-Con confirmed, both Joy-Con can do this
Improved audio abalnce and speakers
Voice chat
3D audio via headsets (supported games and headsets)
Improved stand
USB-C ports on top and bottom
Camera option for USB-C called out specifically..?
256GB internal storage
when docked, up to 4K resolution, HDR supported in TV mode
Backwards compatibility
My first thought too...interesting!