Post has been updated regarding the Spartacus. The change was initially planned as we received a list of updated effects for many of the OCP items. As you can tell from the list here most are buffs. But in this case it would have been a nerf that was not what people paid for. As people paid for this item it will keep it's paid for effect.
i do really hope that this applies to all soon to be nerfed gear, especially DH
because you do know we all gambled and paid for it as well, not only just for spartacus