The sleuths at Reddit have uncovered a bit of info in SEGA financials that leads them to believe Yakuza 6: The Song of Life is coming to PC this year. The PCGamesN post reads:
The leak came, as many do, from a financial report. The game is listed on Sega’s first quarter financial report listing the game for release in North America and Europe in 2018 on PC.Sega confirmed that Yakuza 0 and Yakuza Kiwami (the remake of the original Yakuza) would be coming to PC via Steam at the PC Gaming Show at E3 back in June.
Given SEGA's newfound love of PC ports, and done well, it makes total sense that Yakuza 0 could indeed show up on PC this year or early next. Now... about Persona 5...