It is live right now:
https://www.reddit.com/r/IAmA/comments/84cft2/we_are_haemimont_games_developers_of_tropico_and/
The devs are around and happy to answer questions all day!
Join our AMA!
Build and release context
Recorded Steam release date:
Within one calendar day of this post (UTC). The listed date does not establish an exact launch time.