The script in the teaser trailer is the Aurek-besh alphabet.
This first string says “FIRST CITY”
The blimp sign says “THREAT DETECTED”
The text over the door says “AUTHORIZED PERSONNEL ONLY”
It’s the trailer. FIRST has only used the teaser to announce the theme of the game, and from a theme perspective, it seems that FIRST have their theme pretty nailed down at this point. Also borderlands-esk rendering seems neat.
I don’t think the trailer has ever been indicative any game mechanic or field design.