I'm not sure *what* to expect from the Mayans, tbh. That civ is riddled in potential gimmicks (Dark Age bonuses! Disaster bonuses! Predict the future bonuses!) and I sure hope the devs have been able to rein themselves in and kept the bonuses largely historical. Colombians are the civ I'm actually the most curious about. They don't exactly speak to me as a Civ (colonial nations = snore), but the llanero is a good UU choice and with a unique tile improvement, they could prove to be loads of fun.