Google has offered a few beta releases of its apps in the past, like the Google app and Google Maps, and now a couple more betas are available.
You can now sing up to beta test the Google Play Services and Gboard for Android apps. Doing so is pretty simple, requiring you to visit this page for Google Play Services and this one for Gboard and tapping the “Become a tester” button. You’ll then receive updates for the apps that you signed up for.
