Good to hear. Hopefully they'll streamline the camo and wound treatment systems. As cool as they were at the time it was always very clunky.
It's the first in the series chronologically so there's not a ton to catch up on. There's a small special forces group of freaks that were American heroes in ww2, led by a woman called The Boss. They became disillusioned after the war and stole a prototype, short range nuclear weapon and defected to the USSR.
Meanwhile, The Boss's protégé, Snake, is sent into the USSR to extract a Scientist who is defecting to the USA.
All other relevant backstory and motivations are revealed throughout the game so I wouldn't want to spoil.