Primates are the exception, all the other mammals don't walk on their metacarpals. We weren't designed to stand upright, it's a flaw.
These new Predators would be faster, leaner, and leave a smaller footprint.
Humans walk on the back of their legs, which is why we have arch problems and other ailments, we were meant to walk on our tiptoes, not our metacarpals.
Looking at the pics just posted of the new big Predator on its high heels...I hope the crappy egyptian design 'Fugitive Predator' kicks its ass. Though I'm assuming it won't, it'll die like all the main Predators.