If you think of current tech that could be adapted fairly easily to make something in a smallish buildout for this kind of thing, you could probably make a bipedal mech suit with fuel cell batteries and hydraulic assists (think armored variant of the Aliens suit) without too much trouble. Would be enough for considerable armor plating. Sort of a tank suit.
I think the thing is that suits like that would be not exactly stealthy, and the missions in question are already well fulfilled by ordinary SpecOps folks + drones/etc. Just a lot of expense and complexity to make something incredibly cool but not altogether practical in the big picture.
I realize that this is only loosely related to OP link, but augmented infantry has always interested me. Sadly it's much more likely that we see 'drone' bipedal terminator-like weapons compared to something with a human inside, for a huge multitude of reasons, chief amongst them that humans are a big fleshy fragile waste of space compared to mechanical bits using that weight/space more efficiently for killing purposes.
Petman + armor + 5 years improvements in augmented AI/encrypted remote + weapons = I don't want that thing kicking my door in. Make them fairly cheap to build, then build hundreds of thousands of the damned things. Imagine if post-911, we had sent 500,000 terminators over there instead. Things that can run 35mph, jump 40 feet gaps, punch through concrete walls, carry 350lb packs, collaborate wirelessly to share enemy info instantly, see in the dark 360 degrees, and snipe from miles on target every time. Make them look extra creepy for bonus points. Give them metal skull faces and eyes than can glow red on command. Woot.
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