Before Grin closed down they were developing a Final Fantasy XII sequel codenamed Fortress. Tons of assets leaked, like the Cid-esque moogle and concept art for Queen Ashe.
A two minute YouTube video also surfaced which is said to be “tech demo” footage from the unreleased game. Since we can’t verify the source we’re going to label this as a rumor. It might be Fortress. It might be a mock up for Chocobo Fantasy. Either way, the video is interesting to mull over as a base for an action oriented Final Fantasy XII follow up with Barbarian dudes.