Mnementh on 05 June 2017
Hmm, as I read up about this, an interesting information is that Mistwalker apparently is partnered with SiliconStudio for an unannounced title. This could be well this title that is according to the OP is going to be announced on 22nd.
http://www.siliconera.com/2016/02/22/bravely-series-developer-silicon-studio-teaming-mistwalker-new-game/
https://nowloading.co/p/Final-Fantasy-Creator-Announce-His-New-Game-In-2017/4179098
A RPG by Mistwalker and SiliconStudio together sounds even more sweet.
