Longer lasting ress 15%=> 10% (its supposed to be general but weak just like Aztecs military bonus)
Obsidian arrow back to +4 but unlike in the past it still affects stone buildings which is with +6 just soo broken.
In return they get a fourth bonus which is not really that strong but nice to have: Getting notification of their future doom ie they get texted whenever an opponent player clicks Imp. Featuring the famous Mayan doom calendar and their astronomy.
It always affected stone buildings, with one update they just got another +6 vs stone defense, making them ridiculous against towers.