While Rockstar may be best known for Grand Theft Auto, as well as Red Dead Redemption, their portfolio of games has greater breadth than these two highly successful franchises.
One such other IP is Bully, an open-world game that takes a lot of inspiration from the themes and gameplay of GTA, but transplants it into the setting of a typical British boarding school.
It's possible a hint at Bully 2 was just discovered in GTA Online.
In the recently released Diamond Casino & Resort DLC, players can purchase extravagant penthouses in the city's top gambling institution and decorate said penthouses with various works of art bought with gambling chips won (or lost) at the tables.

These artworks include masterpieces such as a classic Greek style statue that is twerking, a framed painting of the eggplant emoji that everyone uses to symbolize... something else, and most interestingly, an abstract take on the coat of arms of the Bullworth Academy.
The artwork is called "Canis Canem Edit" which is another reference to the game. The phrase is also associated with Bullworth, and the game was released under this name in certain regions where "Bully" would have either required a higher rating or prevented release entirely.
While easily recognizable, the artist took several creative liberties with the painting. The traditional gold and blue color scheme is replaced with green and blue, accented by red and yellow highlights. While in and of itself this seems like more of an easter egg than a tease, the rabbit hole goes deeper.