User blog comment:Damac1214/Call of Duty 2014 Reveal Incoming, Details Revealed Throughout the Day/@comment-5596583-20140501171447

Aside from the powered armor, a couple of technological observations here:

The guy in the foreground is carrying what seem to be magazines for two different types of firearms. One is the right size for pistol rounds, though it's straight, not angled. This suggests a submachine gun or machine pistol (think TMP), rather than a pistol. Not surprising, really, but submachine guns will likely be in the game.

The other magazines are not STANAG, curiously, or a new form of STANAG that's straight. They do look to be about the right size for 5.56mm rounds.

He's carrying something that looks like an ammunition belt, though the "rounds" inside are much larger than anything typically used. Coupled with the fact that he isn't carrying anything that "belt" is attached to, nor does it appear to be part of the armor (the guys in the background do not have one, while they have the armor), I would say he's carrying ammunition for a separate, heavier weapon. Largely a guess, there, though.

The guns held by the two soldiers in the background: I cannot tell whether they are ARs or SMGs, or anything else, really. They do appear to be bullpup, and are equipped with suppressors. The closer of the two background guys seems to have an optic similar to the CoD4 style red dot sight.

Nothing monumental, just a bit of speculation.