Very soon, the expansion pack for Red Dead Redemption, titled, "Outlaws to the End" will be released. So here are some more details and screenshots in relation to this. This time, the co-op modes shown and described are called "The Escape" and "The Herd"
The Escape
You and your team-mates must attack and steal a gold coach along with a
wagon and a Gatling gun. Once acquired, you will be sent to turn them
in to the American Army and then must clear out remaining resistance in
the town of Tumbleweed. After clearing the town, prepare for an
explosive stand-off that will take you all the way to Mexico.
The Herd
Cattle rustlers have taken control of Box Canyon. Fight your way in
and wipe out the rustlers, then use teamwork to protect the herd as you
lead them home to Armadillo while drawing heavy fire from snipers and reinforcements on horseback.
Players take control of the wagon and Gatling gun in "The Escape".
Guiding cattle home to Armadillo in "The Herd".
The team splits up to transport both vehicles in "The Escape".