When the PC edition of Dark Souls was announced, so was extra content, but no mention was made of that content making its way over to consoles. If you were feeling slighted, do so no more: the content is coming over after all.
Dubbed the "Artorias of the Abyss" expansion (say that 10 times fast), it includes more environments, bosses, foes, characters, armour, and weapons, all for the low, low price of $15. That's about 1200 in Microsoft Points.
PC players will still get early access to it when it launches on August 34, though: Artorias won't hit console until winter.