Total War: Rome II's next patch is now live and in open beta. The most important new features include improvements to politics and civil wars, overhauling the building chains in order to create more construction options for all cultures, and balancing the land and naval battles and campaigns.
Instructions on how to test the new features can be found on game's forums. The official release of the update is coming soon, and it will land at the same time as the recently announced Emperor's Edition of the strategy game.
Headline features in the new update include: Politics and civil war improvements, Overhauled building chains, Special regions, Campaign balancing changes, Land battle changes, Naval battle balancing changes. The full list can be found here.