Did you pre-order the game before the 18th of December?
If you didn't pre-order it and have bought it after the 18th you won't be able to play it till the 21st I think.
I still prefer BC2,Im not all that impressed with Vietnam tbh....ive played on two diffrent maps so far and they were not all that great.
Whats going on with the Ranking system? does it carry over from BC2? because when i looked i was rank 29 or something then the next time i looked i was rank 2.