Didn't Sega hire more people over at Nagoshi's studio? Maybe of making a bigger team to pump a AAA game, maybe they structured a 2 team effort to make 2 AA games.
Because after all the buzz around a new IP, Nagoshi working on another Yakuza game would be kinda meh as much as I love Yakuza. The man worked on all kinds of games, he should work on more original stuff.
Now Vanillaware showing off their next game? My penis says yes.