Some new, some old screenshots plus concept art are here for the Dark Souls DLC known as "Artorias of the Abyss". If you aren't good and depressed from the names alone, check the gallery below, which houses dragons, giants, and all manner of weapons to slug them with. I think I spotted a wildebeest as well.
Artorias features more environments, bosses, foes, characters, armour, and weapons. It's priced at $15, and is included with the PC version launching in August; console players will see it wintertime.