Here are some great screen shots and trailer from Battlefield: Bad Company 2 Limited Edition (first guy has some sort of Master Chief look going). The limited edition of Battlefield: Bad Company 2 will feature 6 game “unlocks” that give players a tactical advantage on the battlefield from the minute they fire up the game. These unlocks include:
Four vehicle warfare unlocks
• Improved Vehicle Armor – An up-armor package is mounted on all vehicle types, decreasing the effect of both explosive and penetrating warheads, significantly improving vehicle survivability.
• Supreme Vehicle Firepower – Additional weapon packages are mounted for the driver of all armored vehicles, greatly expanding the range of targets the vehicle can successfully engage and destroy.
• Vehicle Motion Sensor – Use this electronics warfare package to locate enemy units in direct proximity to the vehicle.
• Tracer Dart Pistol – This magnetic dart attaches to any vehicle surface, allowing squad members to track, lock on, and fire rockets onto moving targets even beyond line of sight.
Two classic Battlefield 1943™ weapons
• M1A1 Submachine Gun – Reliable but heavy this classic weapon is a powerful force in the hands of any Battlefield veteran.
• M1911 Pistol – Highly customized M1911 are favored for its dependability and the power of its large .45 caliber round.
Game Play video for Battlefield: Bad Company 2 Limited edition Unlocks:
Article from Gamersyndrome.com
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The Gamersyndrome.com resident expert Dr. Chang who when not operating can often be seen killing zombies or casting fireballs. 
Are the unlocks for the Limited edition players like in the first Bad Company? Because if the neat stuff is only unlocked for the Limited edition players thats a bit BS, always having an upperhand for spending more money seems a bit rediculous to me.
yes it is for limited edition only as far as I know