Rebirth Universe and Justice League Of America #21 Spoilers follow.
Who Is The New Aztek? Do They Join The JLA?
As a refresher here is the DC Comics encyclopedia for the original Aztek.
Well, DC Comics new Aztek is a female person of colour.
Her name is Nayeli Constant and she inherited the Aztek armor from the original under mysterious circumstances.
Despite Ray and Aztek being at odds during the issue, they battled to save their shared home city of Vanity, and gain a new found respect for one another.
Aztek appears on at least one future JLA cover so it may well be that she joins the team.