Apparently, one retailer chose to ship a Nintendo Switch console early and one user has taken the opportunity to upload a video of the UI of the system. Too bad this "unnamed store" couldn't ship him any games to go along with the console.
Elsewhere in the thread the lucky new Switch owner says multiple times he won't be selling the early Switch unit, tempting as the offers have been, because he doesn't want to risk legal trouble from Nintendo.
As you can see from the video, the home menu is very sleek, offering six menu options at the bottom of the screen in addition to main slots in the middle for games. In the Settings menu, the user switches the device's theme from "Basic White" to "Basic Black". However it does show us what the upcoming Switch's UI will look like, and what the setup process involves. Here's the clip that shows the UI in action. The Switch will be officially launched on the 3rd of March, 2017 with a couple of games available at launch, one of which is the highly-anticipated The Legend of Zelda: Breath of the Wild.