We certainly haven’t seen the Hell Hounds before and we’ve seen a fair amount of both the Predator and Super Predator characters in previous trailers, which would seem to imply that eventually, the hunting dogs won’t be working alongside the Super Predator as one might expect.
Either way, the Hell Hounds look pretty imposing here.
It is, of course, very possible that all these clips are not actually in sequence.
The clip at least implies that the Hell Hounds will make their appearance early in the film as they appear while one of the soldiers initially dispatched to investigate the alien crash is being interrogated about what he experienced.