Rockstar Games might have teased Bully 2
Not long ago a Bully Easter Egg appeared in GTAV's Casino update. The players got the chance to buy a house decoration called Canis Canem Edit (Bully's title in Europe). A redditor posted the in-game image you can see below:

Somebody deciphered the photo above using Morse code and he got the following sequence: DNA4. Subtracting 2 from each of the letters and the number the following code was obtained BLY2 which seems to hint at Bully 2.
For now this is just an interesting rumor and should be taken with a grain of salt, but maybe Rockstar are really teasing something.