The game look stunning, the trailer is fantastic BUT...the premise is entirely ridiculous. Even in the paranoia of the Reagan period, the theory of a sudden Soviet invasion of the United States wasn't taken THAT seriously.
If the game is set in our timeline, I simply cannot see where this "invasion" has come from unless it is a small-scale "raid" by disaffected Soviet soldiers. That said, it looks an incredible game...
What makes it even more ridiculous is that according to the orview of the story at their website, this isn't a suprise attack.
West Germany, 1988. To avoid certain collapse, the Soviet army boldly advances into Europe. NATO responds only to be met on a second front -- a diversionary attack on the American homeland.
Now I think that if NATO had been at war with the Warsaw Pact for a year then the US Navy would have noticed a massive fleet of unmarked container ships approaching the west coast and thought it suspicous and worth investigating before it got close to a port.