"Batman: The Dark Knight Returns, Part 2" is the conclusion of the two-part animated adaptation of Frank Miller's graphic novel. There is no direct sequel to these films, as they effectively cover the entire story of Miller's original work. However, the Batman animated universe continues with various other films and series featuring the character, but they are not direct sequels to "The Dark Knight Returns."

In "Batman: The Dark Knight Returns, Part 2," Bruce Wayne fakes his own death as a strategic move to draw out his enemies and to re-emerge as Batman without the constraints of his former identity. By faking his death, he aims to eliminate the threat posed by the government and the new Batman, while also distancing himself from the scrutiny of his past actions. This allows him to fully embrace his role as a vigilante once again and confront the Joker and other adversaries without the limitations that come with his public persona.

As of now, there is no official announcement regarding "The Dark Knight 4." "Batman: The Dark Knight Returns, Part 2" is based on Frank Miller's graphic novel and concludes that story. While there have been various Batman films and animated adaptations, "The Dark Knight" trilogy directed by Christopher Nolan is considered complete with no plans for a fourth installment. Future Batman projects may explore different storylines or universes, but nothing specific about a fourth film in Nolan's series has been confirmed.

In "Batman: The Dark Knight Returns, Part 2," Bruce Wayne, now an older Batman, continues his battle against crime in Gotham City after coming out of retirement. He faces off against the Joker, who has escaped from Arkham Asylum, leading to a deadly confrontation. Meanwhile, Superman is sent by the government to stop Batman, believing him to be a threat. The film culminates in an epic showdown between Batman and Superman, highlighting their differing ideologies and the consequences of their actions. Ultimately, Batman's legacy is solidified as he fights for justice.