This is what I thought was the spoiler for the next primal trial

Mitsutoshi Gondai: We won't stop there, of course─everyone on the dev team will continue working their hardest to create quality content. Hmmm, maybe we'll go with the final boss for the next extreme battle...


Pointing to the ever possible "Singularity Reactor (Extreme)" imo

but I did enjoy Clockwork Doomtrain, the Red/Blue Mage arguments, and pretty much everything Koji Fox said