1) yes it is copyrighted, 100%. BUT you never told us if you plan to make your game commercial...
because if not its a freeware game, and thus you are allowed to use anything from predator franchise.

Like me, im making a Survival Horror game ala Resident Evil, so if i not go commercial i could call my game, i.e. "Resident Evil: The Lost Chapter" or anything. But i do not so, because i dont know yet if i ever wanna sell it or not.

But please anyone correct me if im wrong.

I think if it is a personnal project no matter with copyright.
And i doubt a lot the game to go such quality as the last Predator game on PC !

Why not making original characters, space ships, planet based on hunting with new weapons, powers instead of copying the AAA game ? And there are older predator games, i doubt you reach such
textures, level design ,sound, music and models quality !

Well no matter for a personnal project just go on and make it