The Casino was data mined and a few weeks ago. The Casino had been in the game since the beginning but not accessible.
Now in the latest update which is expected this summer, it will be live according to a teaser by Rockstar. The casino name is The Diamond Casino and Resort. “With something for everyone, The Diamond Casino & Resort will feature lavish amenities, exclusive shopping, first-class entertainment, and state-of-the-art gaming facilities. Whether you’re having a night on the town with friends or a seeking a brief solitary escape, The Diamond Casino & Resort is open to one and all,” Rockstar wrote. They also said, “Come experience the tasteful luxury that the Diamond has to offer including best-in-class concierge, valet parking, the exhilaration of spinning the Lucky Wheel for a chance at life-changing prizes, a finely curated selection of spirits at the bars and lounges, a range of sophisticated table games and much more.”
The inside pictures and other details will be coming soon according to Rockstar.