Gun Runners' Arsenal - adds to the game 27 new types of weapons, 38 new weapons, 40 modifications to existing or new types of weapons, a new ability. In addition, it added 21 test and 5 achievements.
Courier's Stash - this addition provides access to the things that were given at pre-order the game. In addition, it includes 4 sets of: Caravan Pack, Classsic Pack, Mercenary Pack, Tribal Pack.
November 3, 2011 Bethesda has announced a special edition of the Fallout: New Vegas - Ultimate Edition.

Gun Runners' Arsenal adds to the game 27 new types of weapons, 38 new weapons, 40 modifications to existing or new types of weapons, a new ability. In addition, it added 21 test and 5 achievements.

This addition provides access to the things that were given at pre-order the game. In addition, it includes 4 sets of:
Caravan Pack
Classsic Pack
Mercenary Pack
Tribal Pack
Each kit contains equipment, weapons and medicines to help the player at the beginning of the game.

November 3, 2011 Bethesda has announced a special edition of the Fallout: New Vegas - Ultimate Edition, which will include the main game and all the extras:
Fallout: New Vegas (The main game)
Dead Money (Add On)
Honest Hearts (Add On)
Old World Blues (Add On)
Lonesome Road (Add On)
Gun Runners’ Arsenal (Add On)
Courier's Stash (Add On)