Sorry to hear about your cat, man... But you need to chill out. What's with your obsession with the freakin' black hole, man? I'm sure you'll see more of it later, when you get to play the game.
If you like blackholes so much, check out the IMAX documentary Space: Black Holes, with Sam Neil. And stop posting in GODDAMN CAPS, IT'S HARD ON THE EYES.
Now, back on-topic.
The Predators have mandibles, the Protoss don't have mouths. That's one difference, agreed. But look at the appearance and texture of their skin, it's practically the same. There's a lot in common between these 2.
AvP the games were sort of like First Person Shooter versions of Starcraft.