The next Yakuza game is Yakuza Ishin, translated as Yakuza Restoration in English, Sega revealed during its "Yakuza Character General Election" announcement in Japan.
Featuring a protagonist called Ryoma Sakamoto, details such as release date, region and platform for next entry in the Yakuza franchise were not revealed. A Yakuza Restoration website is now live and, according to Siliconera, further details on the game will be divulged in the next issue of Famitsu.
Last week, Sega teased that a "surprise announcement" would be made at Yakuza 5's "Yakuza Character General Election" held at the Alta Vision screen at Shinjuku Station in Tokyo on Aug. 18 at 5:00 p.m. JST. Sega's last Yakuza game was the PlayStation 3-exclusive open-world game, Yakuza 5, which was released in December, 2012 in Japan.
We have reached out to Sega for further information.