Update 6/16: A new rumor suggests that Sekiro: Shadows Die Twice DLC is not in development. Original story follows.
Despite the game's extreme difficulty, many players are certain to have now completed Sekiro: Shadows Die Twice, and a number of these fans are likely to have seen all of Sekiro's endings as well. As such, players may now be wondering if they will have the opportunity to continue their adventures through Sengoku period Japan with some future Sekiro DLC.
Unfortunately for these fans, From Software has yet to make an official statement about its plans for Sekiro: Shadows Die Twice DLC. That said, the developer's recent activities certainly suggest that post-launch Sekiro content is a possibility.
For example, Bloodborne received an exceptional expansion in The Old Hunters. This DLC, which featured beautiful new areas to explore and brutal new weapons to wield, was launched eight months after Bloodborne's release. Furthermore, From Software did not announce The Old Hunters until six months after the base game's launch, which may be how the company approaches confirming DLC for Sekiro as well.
By the same token, From Software's last major action-adventure title, Dark Souls 3, received two DLC updates. The first, Ashes of Ariandel, released slightly more than six months after Dark Souls 3's worldwide launch, and it was announced only two months prior to that. So too, fans had to wait several more months before The Ringed City, the game's second expansion, was confirmed and made available.
The other two games in the Dark Souls series also had varying degrees of post-launch content. Again, these updates followed an announcement and release schedule aligned with what is outlined above.
Thus, players should not rule out the possibility of Sekiro DLC simply because it has not been announced yet. Indeed, if From Software's track record is anything to go on, fans may be hearing news of post-launch plans for the game, perhaps including new Sekiro bosses, around August.
All of that said, the developers may, of course, opt to let the base Sekiro experience stand alone — there is already a great deal of replayability built into the game, due to Sekiro's NG+ system, after all. Hopefully for those that are anxiously awaiting official word, From Software will make a statement sooner rather than later.
Sekiro: Shadows Die Twice is available now for PC, PlayStation 4, and Xbox One.