DA. HYPE. IS. REAL.
So yeah, BO4 is coming out in October, doesn't have Story Mode, but has a Battle Royale mode called "Blackout" claimed to get characters from all the franchise to fight together in a map which is 10x bigger than NUKETOWN (IIRC)
Kind of not happy that it doesn't have Story but it's okay.

Installation (EASY):
Copy the "Mod" folder (recommended to change the folder name to avoid conflicts with other mods) inside ModLoader Folder

Installation (HARD):
Use an IMG editor, open "Player.IMG" file inside GTA SA > models
Find "tshirtheatwht.TXD" and replace it with the one from the mod
Rebuild archive and open the game and join the hype train!!