Illfonic have flat out said that they aren’t creating anymore Fireteam DLCs anytime in the foreseeable future, and that Predator DLCs will be the priority.
The reasoning behind this is Predator DLCs are a lot less costly, and bring in more profit than Fireteam DLCs. They don’t have to worry about anywhere near as much licensing & spending with random Predators or even Movie Predators as opposed to Fireteam DLCs. Heck, Illfonic probably wiped out 50-75% of their budget back in the day just getting Arnold Schwarzenegger’s likeness & voicelines for Dutch. And that’s not even including the likes of the licensing required for Alice Braga (Isabelle) & Marshawn Lynch (Dante).