Just in case Rome 2 wasn't Total enough for you, Sega has announced that all owners of the upcoming RTS will receive "privileged access" to Total War: Arena, a free-to-play "RTS-MOBA-y thing" announced earlier this year. The free-to-play PC game will see 10v10 matches where each player controls three squads.
In addition to getting "advanced beta access," owners of Rome 2 will also get exclusive in-game Legion Armory bonuses and approximately $15 of in-game currency. Rome 2 players will also get automatic "Legion" status, whatever that means.
If you want to be notified of closed beta tests and get access to more "exclusive Vanguard Armory items," you can also sign up for a newsletter on the game's official website.