The second piece of multiplayer downloadable content is hitting God of War: Ascension today. You can purchase new "Primordial Weapons" or just get the free Chimeran Armor. The studio promises more updates to come in the future.
The PlayStation.Blog detailed the new purchasable items, the Armor of Typhon and the Mercenary Blade. These join the previous armors and weapons that are available for $2.99 apiece, so presumably they'll cost the same price.
The blog also teases that the team is planning to introduce more weapons, armors, and maps, including a fourth weapon class.