The function, which was already present on the iPhone (iOS), comes in version 2.19.18 of the test system app for Google. According to the WABetaInfo website, the updated menu will be available in the next stable version of the Android app, released via Google Play. Remember that the alternative platform of instant messaging service is for the development of functions and applications and, therefore, may present some instability problems by the adjustments made constantly.
When you open the menu on a photo, you can also view the new "Set as …" and "Rotate" options. These news, however, are not new features, but a redesign of the interface. Previously, the tools in "Set as …" (profile photo, group image, or wallpaper) were already in the main part of the menu. "Rotate" also condensed the previous two options, "rotate left" and "rotate right".