https://wccftech.com/galaxy-s8-and-note-8-might-be-a-part-of-samsungs-android-pie-beta-soon/

Even though Samsung has rolled out their OneUI-based Android Pie update in some regions, most users are yet to receive it. As expected, the Galaxy Note 9 is next in line for the update, and it may be ready sooner than we think, as it has received what appears to be its final beta update. The next in line is the Galaxy Note 8 and S8, and it appears that Samsung is working on a beta program for their 2017 flagships as well.

Sammobile first spotted the upcoming Android Pie builds on Samsung servers for the S8, S8+, and the Note 8  bearing software versions G950FXXU4ZSA1, G955FXXU4ZSA1, and N950FXXU5ZSA1 respectively. Additionally, the presence of the letter Z in the software version indicates that these are beta builds intended for public release. Although Samsung is yet to make an official announcement about the program, we can expect one after the Galaxy S9+/S9 Plus’ Pie rollout is complete.