It looks like the Terminus beasts are forming from slain mortals.
The ancients immersed in the darkness – perhaps ancients that were dormant in Zodiark? Very possible.
The reference to the line of making the suffering end… hmm… Magus sisters? In German it is something like: "Let’s make the suffering end. What else can we hope for?"
The new voices are hard to place. Especially when they’re running something of a repeat of events from ancient times. I wonder if some might belong to the other Overlords or to the Forum.
Floating zone remains a huge mystery, and makes me wonder if it’s the point of reference for the "world free of sorrow"/"wonderful world” (FR) thing (the line seems like it's from Fourchad in FR and EN but when comparing the JP versions in the trailers, the similarity vanishes) may be from Convocation's exchanges with Venat, or alternatively, the Forum's with the Scions, depending on what their plans are.
Like others, the larger scale of the MSQ, is leading me to question if we’ll perhaps see an extra zone, and maybe trial and/or dungeon. There’s a lot more to cover than usual.
WOL using the summoning rite is interesting. Aid in distant places (Moon, Underworld etc), I guess.
Alphinaud death flags? I’ll believe it when I see it.

I guess they may do it though, it'd be bold.
As an aside, the shift between purple and blue as the dialogue flashes is neat.