An APK teardown helps predict features that may arrive on a service in the future based on work-in-progress code. However, it is possible that such predicted features may not make it to a public release.
In case you missed our previous coverage, the upcoming "Enhance Photo" button will appear within the share menu alongside the Create Link, Send in Photos, Add to Album, and Create Album options. In the previous release, the option opened a preview of the enhanced photo with Cancel and Share buttons. You could also press and hold on the preview to see the original photo. Google has updated this UI in the latest build of Google Photos and added two new filters.