I like the savage cobra-thing

I believe that Milburn tries to get a hold of the Cobralien, which spits acid into his helmet and kills him. If you noticed in the trailer Fifield is just behind Milburn, so maybe while Milburn dies the thing jumps into Fifields arm and gets inside his suit and into his head, turning him into a mutazombie...

The last thing I want to see is the SJ or Engineer turning out to be Predator in the weird suit . After all they were depicted as Gods in AVP .

Yes, the SJ will reveal himself as a Predator just moments before Rambo and Terminator arrive on board of a space converted Titanic which eventually transforms into Optimus Prime and claims the Empire for himself and his five children: Darth Vader and the four Teenage Mutant Ninja Turtles.

Why would you even let something like that cross your mind...? WTF? We've seen their faces already. Predators don't belong here. Simple as that. Although, a cameo in a latter film would be cool!

Aliens, Predators,Terminators,Replicants,The Thing, etc are all masterpiece characters from various Sci-Fi movies. Prometheus should add one more to this long list, SJ or Engineer or whatever it is called. Ridley is obliged to satisfy this, or it will be a great disappointment . Predators dont belong here, but in AVP universe, they are mortal enemies of the Aliens. Who knows, the AVP guys too can use this idea and may come with a prequel, named "AVP:The Beginning " or so to show how the 2 species war began or so . Maybe a good twist will be SJ's made Predators as shepherd to the sheep,instead became hunters of the wild.

Predators are too independant/different to be of SJ origin. Like i said in one of my massive posts, i hope RS makes moments for them. Moments like the Predator taking off his mask at the end of the original film, something like that. They need their signature moments, too. Can't wait.