Theis also available from today, but that's going to cost you some denarii. It adds custom battles and three hybrid factions to the Grand Campaign.
"Cimmeria, Colchis and Pergamom all claim Greek heritage, but their settlement away from their homelands has wrought subtle changes to their culture. Each faction enjoys unique traits, strengths and hybrid unit Rosters that reflect their culturally diverse civic and military aspects."
A new patch for Total War: Rome II is also on the march with more balance changes following feedback.