It's called the Fit Kit, and as you might guess, it's a way to build your own version of the redesigned hatchback. There are 180,000 mechanical parts in the kit - some delivered by drone - but that doesn't seem at all daunting to the pair of obnoxious, self-described tinkerers that star in the Fit Kit ad.
Honestly, the video is pretty entertaining, with some biting satire of the DIY movement and its attendant cadre of mustachioed hipsters.