I'm pretty sure the next 24 man revolves around The Twelve, so I'm sure we'll find out. I assume we'll be fighting them, or at least recreations of them. Who knows, they might surprise us. They might be vengeful spirits at this point, mad that they weren't let in on the 12,000 year plan / Sundering. Beings who expected to be leading Ancient Etheirysians got stuck Sundered and leading Sundered people or something.

Cause I mean, they sure as shoot weren't in on the plan from what we could see directly in 6.0. And if all 12 of those blokes/blokettes in the screenshot are the Twelve then that implies that lesser folk in the Hydaelyn movement made the sacrifices to bring her form about.

Maybe they were let in on the plan, and they became bitter after a couple thousand years. Had to be sealed up or something?

Idk, we could spitball all day and get nowhere. Who knows. Maybe they were the first group of Sundered Ascians, and they were the 12 because Emet didn't/couldn't find'em all.