I've seen all the vids there are to see.
From what I can tell it does not have a gore system like SOF.
It does not seem to have deformable terrain.
Let me tell you about destroyable buildings, its VERY hard to do, and because of this, it is used VERY rarely.
The MP2 movies show about 2 scenes where the floor breaks. I dont know how they did this, maybe assigning the floor to something that breaks into sections when blown up.
But I wouldn't go as far as to say everything is destructable, because I haven't read or seen anything to say such a thing, and I dont think it would fit in with MP gameplay.
However, we can verify all this today when we get the game.