According to word on the grapevine, Samsung could be testing out Android Pie on the Galaxy A5 (2017). Not particularly noteworthy until you realize that the A5 was released on Marshmallow, and a Pie update would be the third major OS it receives.
https://www.notebookcheck.net/The-Samsung-Galaxy-A5-2017-spotted-running-on-Pie-could-get-its-third-major-OS-update.387681.0.html