As Daniel reported earlier, the final Red Dead Redemption DLC Myths and Mavericks Bonus Pack will be free and be coming out some time in September, except we've finally got a firm date: September 13, 2011.
Being the awesome developers that they are, Rockstar will add multiplayer locations including Cochinay, Nekoti Rock, and Beecher's Hope and expand the Stronghold mode to Armadillo, Tumbleweed, and Chuparosa. Rockstar has also released a list of the new maps, modes, and multiplayer characters:
Cochinay – Gold Rush, Shootout, Gang Shootout, Stronghold
Nekoti Rock – Gold Rush, Shootout, Gang Shootout
El Presidio – Gold Rush, Shootout, Gang Shootout
Plainview – Gold Rush, Shootout, Gang Shootout
Gaptooth Mine – Shootout, Gang Shootout
Pike’s Basin – Shootout, Gang Shootout
Rio Bravo – Shootout, Gang Shootout
Perdido – Hold Your Own, Grab the Bag
Benedict Point – Hold Your Own, Grab the Bag
Beecher’s Hope – Stronghold
Torquemada – Stronghold
Armadillo – Stronghold
Chuparosa – Stronghold
Tumbleweed – Stronghold
New Multiplayer Characters
Landon Ricketts
Vicente DeSanta
Drew MacFarlane
Deputy Eli
Deputy Jonah
Javier Esquella
Nastas
Uncle