Update: New weapons.
The Close Quarters trailer was released earlier, featuring the latest Battlefield 3 DLC. This new pack will also bring new weapons to the battlefield. Below is a list of expected new BF3 weapons:
The weapons pictured here do not depict what the weapons in BF3 will look like, these are their real-life variants.
MP5K Machine Pistol
M417 (Sniper Variant)
SPAS-12
IMI Micro Tavor-21
ACW-R
Steyr AUG
LSAT
SCAR-L
L86A1 LSW