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Link - http://www.g4tv.com/videos/57697/battlefield-3-close-quarters-ziba-tower-dlc-trailer/

Weapons Confirmed so Far :
MTAR-21
SPAS-12
ACW-R
LSAT
L86A1 LSW
AUG
SCAR-L

So probably about 10 new guns and 4 new maps just like the last expansion, it will be similar. due to be released in June, PS3 gets the DLC a week early.