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

[A203D]

Well we've speculated this for a long time. I like how the interviewer indirectly insults FF13 by saying that FF12 was complex and mature.

Either way, hopefully the project will be announced soon.

Sqaure Enix employees never comment on rumours until something is offically announced, so its no supprise he didnt say anything. When is FF14-Realm Reborn out? The sooner that is out, the sooner we find out about FF15.