Hexakill Announcement
Strings referencing a "Hexakill" have been added to the game files.
game_announcement_OnChampionHexaKill
"X has slain X for a hexa kill!"
game_announcement_OnChampionHexaKillAnnouncement
"HEXAKILL!"
game_announcement_OnKilledUnitOnKillingSpreeHexaKill
"X has ended X's killing spree for a hexa kill! (Bounty: X)"
No in-game audio yet but the criteria for it lists "Mutator1= 6v6" . [ Speculation: a replacement for the above penta kills such as Legendary kill or perhaps a signal for a future featured game mode ]