Recently, Sega has announced that they will be bringing Ryu Ga Gotoku (Yakuza) 3, 4, and 5 to the PS4, with slight enhancements, starting with 3 on 9 August 2018, in Japan. While these will not be remasters at the level of Yakuza: Kiwami, and Kiwami 2 (Yakuza 1 and 2 respectively) it does seem to be cleaned up visually in respect to Yakuza 3, and its Vaseline sheen seems to have been removed for the most part from its PS3 counterpart. Obviously there is no confirmed release outside of Japan, for either of these three games, but hopefully, with the current upswing of popularity, with the most recent release of Yakuza 6 in the west doing well, and the confirmation of Kiwami 2 set to be released in the west in August of this year, there is a higher probability of these re-releases coming to the west.
E3 is literal weeks away, so hopefully more information about western releases can be given out during that time, because with the majority of the series being on the same console in the west will create a larger demand for the series as a whole outside of Japan. Personally, though, the other games in the series that have yet to release outside of Japan should have release precedence on the PS4, more notably of course being Ryu Ga Gotoku: Ishin, the game where you play as Sakamoto Ryoma, undercover as the commander of the 3rd company in the Shinsengumi Hajime Saitō. While it is of course not completely historically accurate, the game itself is immensely enjoyable. Even if you do not have a total grasp on Japanese history as a whole, there is still enough there to have fun with.
The other game that should be released before these 'remasters' is Ryu Ga Gotoku: Hotoku (Yakuza: Fist Of The North Star) with Kenshiro being the character that Kiryu supplants in this instance. While not a professional when it comes to this series, it is still something that is highly enjoyable, with some of the better melee combat, while still feeling familiar to those who enjoy the Yakuza series as a whole. It does a good job of making it feel like a game that fits within both worlds, while not feeling like the parts from the Yakuza series stand out too much. There is also enough there from Fist Of The North Star to make it feel and play distinct from other entries in the Yakuza seires.
With Ryu Ga Gotoku 3, 4, and 5 seeing 'remasters' to PS4 maybe, (however doubtful) we could see them 'remaster' Ryu Ga Gotoku: Kenzan! onto the console (another PS3 samurai game, that was never released in the west), that is however a bit more unlikely of an occurrence, and even if it does, it is doubtful we would see it here in the west, though it could happen.
Is the Yakuza series something you enjoy, or something that the re-releases of these on a singular console is enough to get you to look into it, leave comments below.