Liars and Cheats

Unreleased The  Pack is an upcoming piece of downloadable content for Red Dead Redemption.

The pack includes:
 * Attack and Defend Multiplayer Competitive Mode and Challenges
 * New Multiplayer Horse Races including mounted combat
 * Play as the heroes and villains of Red Dead Redemption as well as 8 additional multiplayer characters
 * Multiplayer versions of Liar's Dice and Poker from the single-player game
 * A new weapon, the Explosive Rifle, with associated Challenges available in single-player and multiplayer
 * New Achievements/Trophies
 * Pricing: $9.99 (PlayStation Network), 800 Microsoft Points (Xbox LIVE)

It is unconfirmed if Liars and Cheats will contain Blackjack as well.