Fallout: New Vegas Add-ons

Caravan Pack
The Caravan Pack is a Fallout: New Vegas add-on that gives the player access to of extra items at the start of the game. It was announced as a pre-order bonus exclusive to Steam, Wal-Mart, Mighty Ape, and Play.com. It includes lightweight leather armor, the sturdy caravan shotgun, 4 repair kits, and a pair of binoculars.

Classic Pack
The Classic Pack is a Fallout: New Vegas add-on that gives the player access to extra items at the start of the game. It was announced as a pre-order bonus exclusive to the GameStop, GAME and EB Games chains of stores. It includes an armored Vault 13 suit, a weathered 10mm pistol, a Vault 13 canteen, and 5 stimpaks.

Mercenary Pack
The Mercenary Pack is a Fallout: New Vegas add-on that gives the player access to extra items at the start of the game. It was announced as a pre-order bonus exclusive to the Best Buy and JB-Hi Fi (Australia) chains of stores. It includes lightweight metal armor, a mercenary's grenade rifle, 3 super stimpaks, and 3 doctor's bags.

Tribal Pack
The Tribal Pack is a Fallout: New Vegas add-on that gives the player access to extra items at the start of the game. It was announced as a pre-order bonus exclusive to Amazon.com and direct2drive.com. It includes tribal raiding armor, a broad machete, 5 bleak venom doses, and 10 throwing spears.

DLC
Bethesda has confirmed that there will be post-release DLC for Fallout: New Vegas coming out this holiday season. It will be exclusive to Xbox Live. In Bethesda's press release about the add-on, it is said "More details about plans for additional content will be released in the coming weeks.

You can read the official Bethesda press release here.