This enemy can be seen in both the art book (page 087), and in the achievement list for The Assignment. It's a bloated and mutated haunted corpse, bent over backwards, like I hear some of the enemies in Deadly Premonition were. It has an extremely distended stomach/torso area, as well as a large visible ribcage that extends from behind its back and loosely hugs its torso area.
There's a small line drawing of it doing a handstand, with it and its stomach area facing the player, and the ribcage is actually grabbing the player. I'm assuming this is how it will kill you in the game, but we'll have to wait and see. Could create some definite panic, haha
The writeup in the art book is as follows:
If creatures aren't burned after they die, they revive as a bridge and self-destruct near the player.
If someone could upload scans, that'd be awesome. Like I said, page 087.