Yesterday at Unpacked, Samsung announced that it would improve its software support lifespan to three generations of major OS updates, starting with the Galaxy S10 series which will now receive Android 12 when it's available.
https://www.notebookcheck.net/Samsung-confirms-three-years-of-OS-updates-for-its-flagship-phones-starting-with-the-Galaxy-S10-series.484263.0.html