I got it from this bit:
That’ll be even more given that Russell hints at something similar to Fall of the Samurai’s Realm Divide mechanic for the Roman factions - Empire or Republic seems like a likely choice.
True, it's not a direct quote from CA, but the speculation seems to the Realm Divide mechanic, not "the Roman factions." Plus, they also said the Senate was it's own thing with it's own agenda... and that Rome can turn into an Empire, which means a Roman Civil War. Hard to have a civil war with only one faction. And, if they're including all the original factions, that means Julii, Brutii, and Scipii as well.
So, you are right that it hasn't been directly confirmed yet, but I'd put the odds at about 99.5%.
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