During the Square Enix - The Future Q&A Session, a number of user questions have been addressed.
FFXV is being developed using DirectX 11, so porting between PS4 and Xbox One would be easy; and the game has ground and air battles. The Xbox One version will be released worldwide, including Japan.
The reason the game title changed to Final Fantasy XV was because the game has expanded with an epic story, and a larger team is working on the game. With the expansion, the game evolved to take advantage of the next-gen platforms, the main story and world will continue to develop as planned, the game's action, gameplay elements and graphics will be further improved.
Square Enix is not talking about future titles in the FF series at the moment, so cannot say if the FF series becomes action game in future. They believe there is a future for both action RPG and command / turn based RPGs.
There is no plans for a Wii U version of FFXV or Kingdom Hearts 3, because both games are being developed using DirectX 11 and Wii U is not compatible with it.
Square Enix also released an official E3 announcement trailer of Final Fantasy XV (formerly Final Fantasy Versus XIII), which will be heading to PS4 and Xbox One.
I am sad if this is true and there is no direct x11