In an official statement from Square Enix’s CEO Yosuke Matsuda, Tetsuya Nomura will not be directing Final Fantasy XV any longer:
This move allows Tetsuya Nomura to focus his full efforts as the director of other highly anticipated titles, including Kingdom Hearts III.
He then continues:
In reviewing our development structure, we have decided to assign Hajime Tabata as the new director for Final Fantasy XV. Currently, Tabata and the entire development team are working, whole-heartedly, towards completing the production of Final Fantasy XV and ensuring the delivery of the highest quality Final Fantasy title to date. We invite every one of our fans to view the fruits of our labor through Final Fantasy XV’s demo, and promise to present a game that further surpasses expectations when the finished product is released.
As the director of Final Fantasy XV, Tetsuya Nomura has mainly worked on the original concept for the story and universe in addition to creating the characters. Hereafter, he will be focusing his efforts on the production of titles that can only be made possible by Nomura, himself, and delivering products that exceed the quality of past titles, starting with another one of his representative projects, Kingdom Hearts III. Square Enix will continue to work on these titles with the best staff formation in an effort to deliver them to everyone as soon as possible and appreciates your continued support.
Hajime Tabata was the director of Type-0, Crisis Core and The 3rd Birthday. This move will most likely speed up production and allow Nomura to fully devote his time to Kingdom Hearts III.