It's also worth noting that 1899 was when the infamous Blackwater Massacre took place, and according to leaks, Blackwater is on the RDR2 map. We know that Landon Ricketts took part in the massacre as a Lawman and was one of the few to survive the incident, and we also know that members of multiple outlaw gangs took part in the Massacre, so it's possible that some members of Dutch's gang, including playable character Arthur Morgan, will be involved with the Massacre, which means we might see Landon Ricketts as well (which I'd love, he's one of my favorite RDR characters).
Looks like it will play heavily into the plot according to this plot-description
"After a robbery goes badly wrong in the western town of Blackwater, Arthur Morgan and the Van der Linde gang are forced to flee. With federal agents and the best bounty hunters in the nation massing on their heels, the gang must rob, steal and fight their way across the rugged heartland of America in order to survive. As deepening internal divisions threaten to tear the gang apart, Arthur must make a choice between his own ideals and loyalty to the gang who raised him."