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.

Dead Money
Dead Money will be released on December 21, 2010 exclusively for Xbox 360. It'll raise the level cap to 35 and have new acheievments and new perks.

Honest Hearts
It is known to involve the Burned Man and that it will involve a return to New Canaan.

Speculation

 * It was widely speculated that before Fallout: New Vegas was released, Area 51 was to appear, however it didn't. There is not much to support its appearance in future DLCs, however the "Test Site" snowglobe is the only snowglobe in which its location does not appear in the game. But since Fallout 3 has already had an alien related game, and since Area 51 revolves around many alien conspiracies, it is unknown if it will appear.
 * The Courier mentioned in conversation with Johnson Nash did not appear nor be mentioned further (in conversation) in this game. It is somewhat likely he will appear.
 * It is likely that Obsidian will continue the war with the NCR and Legion further.

DLC Announcement History

 * On October 18, 2010 Bethesda confirmed that there will be post-release DLC for Fallout: New Vegas.
 * On November 17, 2010 Dead Money was announced by Major Nelson and Bethesda . It will be exclusive to Xbox Live.