Yakuza series general director Toshihiro Nagoshi has confirmed the next Yakuza game will star Yakuza Online's Ichiban Kasuga and this video may, or may not, be our first peek at it.
The reason I'm hesitant about the news is that it's April Fool's day right now in Japan, and this video appears to suggest the game has command-based RPG battles in it.
However, the video comes via the official YouTube account for Ryu Ga Gotoku Studio, and we do know a new Ichiban Kasuga Yakuza game is in development. As spotted by Gematsu, the video - simply entitled "ryu_new_0401" - appears to show "stolen" footage of the new Yakuza game. Here, take a peek: