Hmm I will have a hard time deciding which mode to play in first. I'm leaning towards 'myth mode' for something new and fancy.
For me, it's an easy choice. For whatever reason, the mythological mode holds no appeal for me; I've always wanted a more historical game. (I"m very aware I'm in the minority in this regard.)
But then, I still intend to get the Amazons DLC...
I also get the very strong vibe that CA held back on a lot of these features on purpose until the Steam release.
Even though Epic users got the game for free, isn't all the fanfare, DLC and new features kind of a middle finger to Epic as a whole?
I don't think it's a middle finger to Epic, so much as CA recognizing they were going to need to have an incentive for fans to purchase the game (again?) once it became available on Steam.
Adding in separate historical and mythological modes (ala Three Kingdoms) was the obvious way to go -- especially since I'm willing to bet their own metrics showed that the original, middle way ("The Truth Behind the Myth" campaign) satisfied almost no one.