The main villain from Yakuza 2 will now be the fourth playable character in the upcoming Yakuza game. The game has not received a name as of yet, but its safe to assume it will be titled Yakuza 5.
“The fourth main character for the next Yakuza game is Ryuji Goda, in his first appearance since Yakuza 2. There has been much demand for his reappearance. This character, who was born as a rival character who gives off a powerful aura, is at last appearing as a main character. Of course, the manly, brawny appeal of Ryuji will be in place. We’ll also be telling a after story for Yakuza 2.” – Toshihiro Nagoshi
I assume you play him in a flash back or the character has flash backs during the game? Makes sense I guess. The other 3 characters that have been announced are Goro Majima, Kiryu Kazuma and Shun Akiyama. More information should come to light at TGS next month.