
I think there is a right shoulder and a long right arm in the left side of the poster. I believe it belongs to the right leg (next to the xeno head) and the left leg (next to the engineer's head). The two legs and the two knees look the same. The left leg seems to end in a tentacle but it does not, it is behind the engineer's body. I tried to hihglight the limbs in the image - and something which is covering the head.
Identical arm pattern and three dots close to the knees:
It is easy to see in the poster that both legs have three small dots close to the knee, they have the same pattern. These dots close to the knee can be discovered in this image as well:
I think we can claim that the new poster shows the biomecha xeno/the mutated Shaw/the first queen/a new monster as well. We can pick one...

I think I can see the left leg. The other things I am not as sure about.

Now that you pointed it out, it looks as if the Alien in the center is emerging from between legs maybe? The highlighted one would be the right leg and it is blocking the left leg from view. Its right arm appears to be holding onto what might be the figure's right hip?

wow, took the usual romancers longer than I would have expected to find a Shaw in that picture. This calls for a space facepalm

A: Looks as though it's a partially obscured head
B: The neck
C: Shoulder joint
D: Upperarm
E: Forearm
F: Clean line break for edge of torso
G: Next joint + hand/foot?
H & I: Clean full tentacles?

I am not quite seeing it, its a very ambiguous piece of work that we can all maybe see different things from.
If there is one thing i can make out is the back ground is like a Wall that has come alive and has Tentacles and indeed these seem to have more Bio-Mechanical look than the Xenomorphs in this image.
I think the big question would be why this Poster, what is it trying to tell us and from what period?
I think its likely showing what became of the Engineers or related beings after Rebellion..
R.I.P Sox 01/01/2006 - 11/10/2017

Actually, that seems to be one of the marks of good art- it is right there and we can see different things in it.
......because we choose to believe DOH!

£1 to who ever finds the Unicorn lol
R.I.P Sox 01/01/2006 - 11/10/2017

Nycro, thanks, we are talking about the same deatails.
Different position of the image, ribs, arm, legs, three dots...
Both legs have three small dots close to the knee, they have the same pattern, I hope it will help:

The pattern of the arm in question from the poster looks the same as the arm pattern of the alien xenomorph:

I'm with ya Ati. I see it as well.
@Fifield:. Why is Shaw holding a gun in her left hand in the facepalm picture?

@IF LOL
Jockey's true identity after 38 years of mystery, the Galaxy's chief un-gun distributor...!

I can't see anything of what you are talking about. The only thing I see is some sort of "Living hive-abomination". With heads, tentacles and maybe an entire Alien forming and growing from it.

Thanks for the extra details ATI
indeed those 3 dots and the way those Legs are do look very much like the 1979 Big Chap Legs, but in this image both Legs end in like Tentacles...
So i dont think it clearly shows us Legs, but then its one of those vague pieces that combines parts from various parts of the Xenomorphs to make it very ambiguous
What i can make out and especially since you pointed out what you was trying to show, is the back ground is very Bio-Mechanical and it appears as thought the background has merged with it some Monster that has Tentacles and some of these are indeed very Bio-Mechanical like the 1979 Xenomorphs Legs.
The Xenomorphs we can make out though in this image, lack the Bio-Mechanical detail of the Big Chap from Alien and are very much similar to those we see in the Trailers.
Also of note is the Sideshow Aliens King Alien Statue, has Xenomorphs that also seem to not have that Bio-Mechanical Arms and Legs of the 1979 Xenomorph and they also look like the ones in the Trailer.
Maybe they are changing the Aesthetic Designs of the Xenomorph?
R.I.P Sox 01/01/2006 - 11/10/2017

Awesome Ati. Here is a head shot of what looks like the biomechanical.

That is pretty funny Goddamn Tropics in here.

Sorry to be OT but I see no signs of inner jaws on any of the creatures.

BigDave - Indeed. :) Is that a machine or a huge facehugger on the head?
I think the creature in question is a xenomorph/the mutated Shaw/the first queen/mother creature of horror to come - pick one.
Thanks for the comments.

Inquisitor Fifield - I think it's hightime to change your user name to Captain Funfield.

I do not see any inner jaws either dk.