Don’t read on if you want to be surprised, but we have some more details about the bosses in Dark Souls II thanks to the ESRB description.
You are about to go over the cliff…
Dark Souls II reportedly has a "giant snake boss holding a severed head" and "a giant boss creature composed of hundreds of corpses." Giant rats return along with the usual ghouls, zombies, and skeletons you would expect from a Souls game.
This is a role-playing game in which players assume the role of an undead fighter in the realm of Drangleic. Players traverse dungeon-like settings and battle a variety of fantastical enemies (e.g., ghouls, zombies, skeletons, giant rats) to gain souls. Players use knives, swords, and arrows to defeat enemies. Combat is highlighted by cries of pain and small splashes of blood. Some locations depict instances of blood and gore: a giant snake boss holding its severed head; a giant boss creature composed of hundreds of corpses; dead ogres near a pool of blood; a torture device with streaks of blood. During the course of the game, a boss creature appears partially topless (e.g. hair barely covering breasts). The words ‘bastard’ and “pr*ck” can be heard in the dialogue.