Windows update is out. It's rolling, so not everyone will get it immediately, but it should be available for you in the next day or so if it isn't already. It is an optional update, so it will only show if you have optional non-security updates toggled on. It does come with the Copilot preview app.
I can't give you like a comprehensive review of Copilot yet, but I have poked at it a few times. So far Copilot is basically a Bing Chat/ChatGPT sidebar that can also open apps on your computer or change settings or modes - for example, I was able to ask it to switch dark mode on or off, turn on Do Not Disturb, start a Focus session (you know what those are, right?

), and switch Bluetooth on or off.
Launching apps is a bit there and not. It can launch all of the bundled Windows and Store apps and....SOME things that are installed with winget, but not everything. I haven't found a pattern yet as far as what winget-installed things it can launch and what it can't. It will launch Bitwarden and Discord and my VPN, but not Blender or Voicemeeter.
Being a preview, there's not really any integration yet. It could launch Outlook, but it couldn't put an appointment on the calendar like Cortana could. The only settings toggle right now lets it see what's on the active tab on open Edge browser for context when asking things - I haven't played with that yet. I haven't tried voice interaction yet either.
Aside from the Copilot stuff, I've seen some nice improvements. I forgot to take a mental snapshot of the File Explorer before installing the update, so I don't know 1-to-1 what's different, but there is now an address bar with navigation buttons and the tabs above that. It doesn't seem any more difficult to use or get used to than the previous one.
Oh, one big surprise - if you open the Volume Mixer you now get individual volume sliders and input/output device selection for every open application which...that's really nice! I didn't even catch that in the release notes.