Android will be dubbed as Android 8.0, and not Android 7.2. According to AndroidPolice, the developer beta has been rolled out, and Android 8.0 is the version mentioned in the ‘About phone’ section of the phone.
Google’s Android O beta is available for regular users as well, provided you have the right smartphone. The Android O beta went live for users after Google’s I/O conference, and currently Google Nexus 5X, Nexus 6P, Nexus Player, Pixel C tablet, Google Pixel and Pixel XL.
Google says you can take the device off the Android O beta list anytime. However, before you decide to do that, make sure you take a backup up of all the data on your phone.