The Authority movie was part of January 2023's initial slate announcement for the DCU but it sounds like the film is still pretty far off despite the fact that The Engineer appears in Superman.

The day was June 24, 2024 and io9 was in Cleveland to watch the filming of James Gunn’s Superman. At the end of a giant battle over the streets of Metropolis, the Man of Steel knelt down to kiss and profess his love to an inanimate object that special effects would later transform into his dog,

Less than two weeks before the release of Superman in cinemas, James Gunn has confirmed that the character will be back sooner than we expected. The director and DC Studios co-head is already teasing the return of the superhero played by David Corenswet, but that doesn't necessarily mean a sequel is already in the works.