In their most recent dev blog, Riot devs laid out their roadmap for 2020, including tweaks for autofill, punishments/bans, MMR transparency, etc. Read more on the story here:
It's no secret that Pantheon is a problem. He has been banned in all but one single Play-In Stage game, and was, of course, immediately first picked and won the game. But this has been problematic before, and it needs to be fixed.