Kukulkan isn't actually a new character for the game but a reworked Ao Kuang (who has been temporarily retired). While Kukulkan enjoys a new look, the abilities transferred over from Ao Kuang remain the same. Players who previously owned Ao Kuang will see that character transform into Kukulkan instead.
We've got the full god reveal video after the break, so welcome in your newest nightmare and ally!
[Thanks to Sorenthaz for the tip!]