The Total War: ROME II – Emperor Edition is now available, offering the promised updated version of Creative Assembly's historical strategy game. This is also available as a free update for those who already own the game, adding new units, previously released free content, and Max OS X support. Here's word:

The Total War: ROME II - Emperor Edition is upon us. The definitive version of ROME II is now available for PC and Mac via SteamPlay at your trusted retailer. If you’re an existing owner of ROME II and have automatic updates enabled, Steam will update the game to the Emperor Edition for free.

Alongside all previously released updates and free content it comes with significant improvements to the politics system and civil war mechanic, an overhaul of the building chains, extensive rebalancing of the campaign as well as land and naval battles, an improved UI, tweaked and improved graphics and more. Full patch notes can be found on the wiki:
http://wiki.totalwar.com

Finally the Emperor Edition includes Armenia as a new playable faction in the Grand Campaign as well as in the Imperator August campaign, our largest campaign pack for ROME II to date, which throws you in the chaos of the Roman Civil War that saw the Roman Republic fall and the Roman Empire rise, with Augustus as its sole leader. Which side will you take?
You can find more information about the Campaign on the official Total War Wiki.

Get your copy:
http://www.totalwar.com/