Hiroyuki Ito (Director FF6, FF9 and FF12) hints that he's working on FF15 in recent interview

[Runa216]

I think the funniest argument I ever had with anyone concerning the quality of FFXII's battle system was claiming that 13's was better...becuase you have the same amount of control in that game.

Serious, some dude tried to convince me that final Fantasy XIII's battle system was just as deep and nuanced as XII's, and I laughed. I couldn't take that person seriously.