writes on its forum (registration required) that a slip in the code from an earlier patch caused the "morph values" for character models to become altered. Apparently, the only body part -- at least, the only part anyone's complaining about -- to become amended were player's breasts.
The company posted that it is working to fix the error and informs players, "Your breasts should be back to normal soon." Thankfully, Age of Conan's mammary incident didn't have some reverse effect on men's pectorals.
[Via Kotaku, 1UP]