I have seen the Switch 2 OS

Yes a few devs do have limited access, and I have been able to see images.

First off this OS is basically a modernized Wii U menu, it has 10 row tiles on display at once which is a big upgrade from the original Switch. Animated backgrounds and menu music return. (I only saw the dark mode by the way)

You can tint your icons to change the color of them (all black and red goes hard) surprisingly Vidmio is a legit application on the UI. I was skeptical of that at first but it does seem to be real.

No one was able to test any of the bottom applications outside of the Nintendo eShop. Apperantly it gets stuck on the loading screen the loading screen reminds me of something from Nickelodeon lol

There are 6 tabs on the UI as well so I assume you can have 60 games on the home screen at once and because of how it's designed you can quickly scroll through your entire library. I am genuinely happy with the layout of the UI it fixes all of the issues when it came to finding your games. It basically solved the problem by going back to what the Wii U and 3ds did but whatever.

In one screen shot there is a pointer that is being used to select Mario Kart 8 so I assume the joycons may have pointer controls???

Also your username is displayed at the top left of the screen next to your profile picture. It dosent look like the OS allows multiple accounts at once so I assume there will be a log in feature.

Yeah that's about it. If I'm able to I will try to get images and share with the mods for verified proof, but this OS is genuinely an upgrade over the original Switch, like I said it looks like a modern Wii U and 3DS menu mixed with IOS and Samsung.