The next Snapdragon flagship processor may be expected to be called the SD 855. However, the most recent leaks on this subject suggest that it will not follow the motifs typically associated with this series - in fact, not even the naming convention will remain the same.
https://www.notebookcheck.net/855-no-longer-Latest-leaks-suggest-major-upheavals-for-next-SD-chipset.323550.0.html