Square-Enix are not surprisingly the team leading up the Dirge of Cerberus. Apart from this, we are not totally clear yet who specifically will be working on the game. We do know, however, that Tetsuya Nomura will be the character designer, as normal with recent Final Fantasy games.
As such, Tetsuya Nomura will play a key role in the game, being the head of character development.
It is also suggested that both Takayoshi Nakazato and Yoshinori Kitase who were both a part of Final Fantasy VIII, X and X-2 will be working on the game, which, if you’re a hardcore Final Fantasy fan, is very good news indeed!