has issued a new patch for Total War: Rome II
adding numerous optimizations and gameplay improvements, and a big focus on siege AI. Specifically, this update enables the battle AI to use its siege equipment more effectively, and employ its combined forces with a much greater level of co-ordination. This provides the player with a sharpened level of challenge, and a considerably more satisfying siege-battle experience.
For the full, extensive list of improvements and bug fixes, visit this page