I'm afraid the jury's still out on that one.
Final Fantasy XI Reboot (tentative name) is an upcoming mobile remake of Final Fantasy XI, originally released for the PlayStation 2 in 2002. The mobile game was announced in March 2015 as Final Fantasy XI Mobile as a part of the Vana'diel Project. The game is being developed by Korean company Nexon.
Although the game was originally slated for a 2016 release, it remains unreleased as of 2019.
On March 19, 2015, Square Enix announced the mobile remake of Final Fantasy XI at a special press conference.
On April 27, 2016, Nexon unveiled the first screenshots of the mobile game, titled as Final Fantasy XI Reboot, at the Nexon Developer Conference (NDC), featuring what appears to be a redesigned Windurst and Sarutabaruta. It was revealed that the reboot runs on Unreal Engine 4.
Although no official news has been released for the game since NDC 2016, Nexon has been actively hiring for roles relating to the development of Final Fantasy XI Reboot, as shown on their careers portal.
An interview dated November 12, 2017 stated the game is under development and that they are working on the battle system.
A letter to Nexon's shareholders released on 25 March 2019 briefly mentioned the game as still being under development, stating that the company's partnership with Square Enix has been difficult but fruitful. It also seemed to confirm the game's title to be Final Fantasy XI R, first seen in a company roadmap graphic a few weeks earlier.