I think he talkin about DLC content more so then a new Red Dead game..
Story DLC I'd l want
Undead Nightmare 2, Play as Arthur with the gang still, they find and steal a cursed artifact, Dutch sees it as an opportunity to be a god of west, Indian chief begs them to return it back so order will be restored, they can then have Dutch run off with Micah, Bill and Javier, thus leaving Arthur, John, Charles and Sadie as his group. the DLC story is pretty much finding dutch wherever he runs across the map to put an end to it all.
Also have Arthur get bit by a zombie in the last mission
have Dutch and Arthur fight (with a shyt load of zombies around) while Arthur tries to get Dutch to see that he only wants power
if executed properly it would be GOAT.
....or play as Sadie in a story expansion