According to a statement from Nintendo to IGN (IGN article) Nintendo Switch sytems that were sold early were apparently stolen by Employees of a distributor in the United States. Here is the Nintendo statement;
“Earlier this week, individuals claimed to prematurely purchase a small number of Nintendo Switch systems from an unspecified retailer. Nintendo has determined these units were stolen in an isolated incident by employees of a U.S. distributor, with one system being illegally resold. The individuals involved have been identified, terminated from their place of employment and are under investigation by local law enforcement authorities on criminal charges.
Nintendo Switch will launch worldwide on March 3, 2017, and we look forward to everyone being able to discover the wonders of the new system for themselves at that time.”
below is a link to a video of the Switch’s UI.