From the details, it's sounding like it could be the best MGS title yet, in terms of realism and gameplay. A bit of old-school weaponry and stealth, with no superhuman cyborgs or automated space laser camera gun helicopter turrets to contend with.
Hopefully there'll be some 60s hardware to take on, though - they certainly knew how to make a decent tank back in those days, and an old-style, diesel-powered Metal Gear antecendent would be pretty fun.