This is a few days old but I couldn't find a thread for it. Thanks to Dualshockers for translating the interviews:
So looks like Nagoshi himself wants to do more turn based games, but depending on the fan reception they might go back to action or even do a hybrid.
Toshihiro Nagoshi: Making Ryu Ga Gotoku 7 into an RPG was a big challenge. For the next game, we can keep going with RPG and make something that surpasses it. We can also go back to action. We could also make a hybrid system mixing action and the new RPG system. All of these are possible scenarios.
Toshihiro Nagoshi: Personally speaking, I want to keep going through the same road, and see what we could improve. For example, making the battle system even more enjoyable, by adding new functionalities related to the terrain and the battles' areas. We could also strengthen the company management mode. Things like that. But for now, I don't wanna think about all that yet (laughs).
So looks like Nagoshi himself wants to do more turn based games, but depending on the fan reception they might go back to action or even do a hybrid.