Apparently acquired early via a retail mistake, a video of the Nintendo Switch's UI has appeared online this morning.
The video, uploaded by hiphoptherobot and posted to NeoGAF, showcases the basic system settings and various functions. The video also shows off the Switch's touchscreen capability - the first we've really seen - and there's options for the TV resolution, adjusting screen size, RGB range, screen burn-in reduction, and more.
The system only takes a few seconds to boot from launch, and there's a little preview of what you can expect from the startup menu as well. The backend also shows the console having just under 26GB of free storage space, confirming suggestions the base console would ship with 32GB of onboard storage (with the difference being made up by the Switch OS).