Steam Database, a tool that tracks down applications and packages on Steam has picked up a recent update for an application of Yakuza: Like a Dragon (aka Yakuza 7), the latest installment in the Yakuza series as of this writing. While it is unusual for Yakuza 6 to still not be available on Steam, Yakuza: Like a Dragon is possibly next in line since it has key differences that separate it from past installments. Mainly because it focuses on a new character Ichiban Kasuga and adapts a turn based battle style inspired by the Dragon Quest games (which funnily enough is referenced in-game).
However, SEGA has not officially announced anything about Yakuza: Like a Dragon coming to Steam at this time, and there is no page officially uploaded. It’s also unknown what features the game will support with a PC release, but it will likely support higher resolutions and frame rates, similar to past Yakuza games released on Steam.