thats the first time i have seen both leaked trailers and the thing i am curious about is whats with the stomachs distending , it appears to be in both trailers , i can see that more clearly than the serpents heads
the first trailer i see the bit every one is suggesting is the serpent head but dont have a clue what to make of it
the second trailer i think given the context and the fact its right at the beginning i would be more inclined to think its the hallway to the hyper sleep chamber
i did see an image in the second that looked like something small bursting/breaking out , but again not really sure.