The characters of the loaded content of King of Fighters XV GIS HIS HOVERD, Billy Kane and Ryuji Yamazaki from the South City team will be added to the game on May 17.

This was reported by SNK

Team Southtown Billy, Yamazaki & Geese - King of Fighters XV reaction - May 17 release
In addition, the publisher will release a free update for the game, which will add tracks from The King of Fighters Neowave to the in -game “DJ Station”.
In the future, it is also planned to release additional tracks.
King of Fighters XV is already available for PlayStation 5, Xbox Series, PlayStation 4 and PC via Steam, Epic Games Store and Microsoft Store.