Android O looks like an exciting new release for Android, but it’s not set for release for another few months. Fortunately, if you happen to own a Pixel or newer Nexus device and have a brave mindset, you can go ahead and sign up to test out the beta from the Google I/O 2017 keynote ahead of everyone else.
Google has opened up a website where you can sign up to enlist in the beta, after which you’ll get an OTA update that will update your Pixel, Pixel XL, Pixel C, Nexus 5X, Nexus 6P, or Nexus Player to the unstable release channel. It’s free, but it’s a beta, so expect issues.
After the beta ends, your device will be updated to the stable Android O release, whatever that happens to be called. Things will be back to normal once that happens.
If you’re interested, you can sign up at Google’s website.