I've found that there are various versions of the game running around, well not versions but a lil bounus depending where you buy it from. I bought my copy at gamestop and received a code that you have to type in to get a map, although my friend bought his at Best Buy and received a different cheat one that requires pressing buttons to unlock a gun...not sure if i can post the cheats or not so ill just let it be.

They are:

HOLD RB DOWN DOWN UP UP X B X B Y UP UP Y
You get the TAR21 Unlocked

EXTRA COMCAST GIFT: Enter "Comcast Faster"
Get the comcast event map unlocked

Register at www.ubi.com FORUMS
Main Menu -> Extras -> Exclusive Content
Enter your ubi forum user name and password and you get the map "Streets" free

See for more info on ubi map
http://forums.ubi.com/eve/forums/a/tpc/f/1...16/m/7761076246