There were rumors that GTAO Next Update will feature the casino, I can confirm it.
Just now, R* have updated the background script to set specific dates that will apply changes to the casino.
You'll notice changes happening near the casino as we move closer to release.#GTAOnline pic.twitter.com/nPb4V9OVg3

— Tez2 (@TezFunz2) June 6, 2019