Monsters picked up corpses lying on the ground and then walked near the banshee and died, perhaps?

The piles are always on both sides of the room, and are always 10-15 big. I've been at this level 3 times now with the prereleases. I also reached this place long before they would even have time to pick up that many corpses. Technically possible since I didn't bother to apply the monster detection ability of the mindcrafter I'm currently playing, but highly improbable.

EDIT: In fact, there's a pile of corpses in every single corridor leading to the banshee's room like this. Definitely wasn't random monsters picking up stuff.

I've been assuming this is a combination of picked-up corpses and monsters getting within range of her wails.

But agree that there isn't enough time for this, so maybe it is intentionally done this way, to warn the player that something is up.

TB did mention he added some extra warning, maybe these stacks are one of the additions?

I think the message upon entering the level is a lot more urgent now

I think this is new intentional behavior and part of the "more obvious warning" coupled with the new message upon entering the level.

Is very likely intentional, but let Thomas take a look at the distribution of the corpses.

I think this was an intentional change to give a big hint about the upcoming danger. It's only started happening in recent prereleases (maybe pre7?)

It's intentional to tell people that _now_ things really are getting serious.