As early as April of this year, Square Enix had confirmed the work on a comprehensive Next-Gen project, which is being developed by the 3rd Development Division. Now there is a first concept-style to it, which suggests a little, in which direction the project will go.
The game is under the direction of Final Fantasy XIV director and producer Naoki Yoshida. The publisher sees it as a "broad-based HD project for the next generation", whose first development phase has already been completed and you are in full production, so a timely release for the launch of the new generation would be possible.
The concept-art itself is reminiscent of a fantasy universe, the Square Enix comments as follows:
"After Final Fantasy XIV, a new core project has been launched and the challenge for the next generation has begun. This project has already completed the initial development and development environment and is now entering a comprehensive development phase. Therefore we are looking for developers who make the world "interesting", "funny" and "surprising". "
As mentioned, there are currently no official information about the game, so you have to wait here for a while.