However, there really isn’t much you can do with a Switch without games as the eShop itself is held back for a day one update – probably because of this exact fear becoming reality. That being said, one of the lucky people who “know someone” recorded a video of the Switch UI, specifically the part where you can choose an avatar or make a Mii.
Personally, they didn’t really show enough of Mii Maker to get me excited about the new stuff (they stuck with mostly defaults), but they did show that even the default avatars have a bit of customization to them.
The biggest take away though is obviously how simplistic the UI is. If that wasn’t enough, a few days back someone showed off other aspects of the UI: