Super duper sorry to hijack momentarily.
The beginning of the trailer has a Mk.III'ish looking design but it is modified in areas. But at the end, it's an entirely different chest plate with a slightly different color scheme but everything else seems to be roughly the same.
Maybe a Mk.IV and a Mk.V instead of a revamped Mk.III and then a Mk.IV?
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On topic, fantastic torso work thus far! I'm using a lot of what you guys are doing as a guide for my own though I've had some setbacks in sculpting but - I'm learining!