So it seems that after the period of strict iron rule imposed during the brutal war against GTA Online hackers by Rockstar, the game developers' sense of humor is returning slowly and steadily. With countless GTA V related rumors springing up based on information uncovered by data miners, players who dig around in the game's code and files to discover hidden data, Rockstar has decided to put an end to it. In a move befitting Rockstar's silly-funny public persona, seemingly they've begun to hide false info in the game files to throw data miners and tipsters off track.
Months ago, rumors regarding the eventual opening of the GTA 5 casino began circulating. It all began when someone reported that the sign on the casino changed from "opening soon" to "opening next week". When no-one else encountered the phenomenon, and it was noted that the tipster was playing a PC version, it was concluded that he simply used a mod to gain fifteen minutes of fame. True enough, the casino has remained closed to this day, but the rumors have not died down. I mean, just thinking about it, it would be logical for Rockstar to do something with the casino, adding a gambling system to the in-game economy.
Another rumored DLC was the so-called "Mansions" update, which would add ridiculously over priced properties to the game with countless luxurious features for players with an endless wallet (possibly made possible through gambling wins) to blow their GTA $ on.