Also, maybe the element wheels will be changed - anyone notice how the primals are laid out on the primal poster behind Yoshi-P and co. during the live interview?

Bahamut
^
Ifrit <-> Shiva
Garuda <-> Titan
Leviathan <-> Ramuh
v
Odin

It could just be coincidence, but seeing the opposites now in place...maybe an introduction of polar elements, rather than wheels? And back to the old FF tradition where Fire was paired with Ice, Water with Lightning?