What about a slaughter house map DLC like at the end of pred 2. Where your objective is to freeze and capture the predator.
On the HUD you could have a freeze meter, where everytime you hit the predator the meter would fill up until its fully frozen.
Also with this DLC you get the Peter Keys character, voiced by Gary Busey.
Farfetched idea, but i think it would be a really ‘cool’ one 👍