Guesses as to what the new mystery MSQ trial coming in 4.3 will be? (Spoilers)

[KageTokage]

Thoughts on the trailer:

After seeing it, I'm still confused about what the trial could be, because the small arena + lack of other players present during that bit with Asahi and Zenos makes me think that it's a MSQ duty (Though it's also possible it could be a mechanic similar to Phantom train that separates the party and forces them to fight their own battles).

That strange haze veiling everything plus the Doman civilians attacking the WoL (I'd assume they're probably the prisoners) makes me feel like there's something very abnormal going on there.

There's also the matter of that ominous voice saying "You shall pay for what you've done in blood"...

EDIT: After someone pointed out that those two Domans are Yotsuyu's parents, I get the impression we're going to be getting thrown into some trippy battle in Yotsuyu's mind courtesy of our Echo powers. I assume that clash between Zenos and Gosetsu is meant to be a representation of her original personality and Tsuyu fighting for dominance. It wouldn't surprise me if this ends up happening after she gets transformed into a primal somehow (I'm leaning towards the mirror being the catalyst and the mental turmoil of her memories resurfacing being the trigger) and during the resulting battle in an attempt to bring a peaceful resolution to the matter.