I think that it's gotten to the point where we would have to come up with some more original weapons. I don't think it would be that hard. The way I see it, is that the Predators weapons all have multiple uses. Also, a big factor is that each weapon HAS to have some kind of a grisly, or just horribly wrong and awful PAY-OFF. For example, the Net-Launcher traps the creatures prey, but at the same time the net constricts around the victim. Sassy! The spear, is... well it's a spear. He spears prey with it, BUT it also electrocutes the victim. Nice! The wrist-blades are a tool, but they're also used as a weapon. Saucey! The Cannon, Disc, and Darts are more straight-forward; with the exception of the Disc being used as a melee weapon as well. In AVP:Extinction, there were a few Predators that used "Bleeder-Spears." Again, to disable the prey and drain them of blood.
I had an idea for a type of dart that's fired from either side of the blade-gauntlet housing. Basically, it's kind of a one-shot deal in the sense it's fired towards center body mass. If it's aimed anywhere else it just wouldn't have the same kind of effect (well it would, but that's not the point.) I call it the Rib-Spreader. Upon impact, the body of the spear/dart "umbrellas" inside the victim causing massive lacerations. The dart itself is meant to unbelievably cripple prey - not necesarily kill right away. So, the Predator will circle you gloating while you're on the ground and this thing is tearing you up on the inside. I tried to think of it this way - I think, that, the Predators are more masochistic in their ways, and get some kind of morbid enjoyment out of killing stuff. I know they have established rules and practices for each hunt; but I think once those are respectfully honored, all bets are off.
I've got more ideas, I just need to put them down on paper first.