There is currently no clear information about the sequel. However, considering Pixar and Disney's strategies for sequels, it is highly likely that the second film in the series is planned. Usually, sequels of animated films are released within 2-3 years if successful revenue is generated.
Therefore, the release date of Luca 2 can be estimated as 2026-2027. However, this process may be extended or the project may be canceled due to new projects or different priorities. It is difficult to give an exact date as there is no official statement from the filmmakers at the moment.