Yakuza Kiwami, a HD remake of the first game in the series, is out in the West next week. And when you're done with it you can start getting ready for a HD remake of its sequel, Yakuza 2.
A preorder listing for the game (originally released in 2006) has turned up on Taiwan's PlayStation Store, mentioning the same improvements as featured in Kiwami, such as a new PS4 engine and re-recorded audio.
When this is released in the West is anyone's guess, but we got two Yakuza games (0 and Kiwami) this year. Maybe we can get both 6 and Kiwami 2 in 2018?