I'm not sure if this has been posted yet, but in the UK trailer, you can see what may be a "proto-xenomorph" at 2:06 when a person is being tossed across the screen. Play it frame by frame and you'll notice the extended right arm, clawed hand, and you'll even see a xeno-style dome head with the impression of a skull face.
This could be an optical illusion, but I can't shake it.
Looks like it most likely follows Mohawk as he jumps down, so the changeover could be rapid. The head is either bulbous or elongated. The hair is likewise absent.