It actually has connections to the mythology surrounding the FNC XIII collection, for instance it has l'Cie and Focus and the gods but its a very different and frankly superior version of it from what XIII tried to accomplish.

While I haven't played the full version I spent some time with the demo and can say I feel like its a return to form of the PS1 era FFs with lots of cinematic moments weaved into the dungeons. Combat was not ideal but since it was a demo I'm hoping that mechanics that weren't shown will fix that issue. It was a surprisingly dark game for what I actually got to see. It was kind of like XII's opening took up to 11 in terms of showing the horror of war.