Last year reports suggested that Marvel Studio was developing a NOVA. Avengers: Endgame co-director Joe Russo also revealed that the best chance of Nova appearing in the Marvel Cinematic Universe would be in a Guardians of the Galaxy film.
Kevin Feige also revealed Nova was a big part of Guardians of the Galaxy film universe.
Nova is… if we have a big board with a bunch of characters that have more immediate potential, Nova is on that board. Because of the connection to the Guardians’ universe, because there is more than one example to pull from in the comics that are interesting. And you’re absolutely right, he was in the earliest drafts of the [Guardians of the Galaxy].
According to The Illuminerdi, a “recent listing” from the project has revealed that Marvel Studios is in the early stages of developing the NOVA solo movie or series. A source also says the Nove project is likely to be part of phase 5 of the MCU.
Gunn already introduced the Nova Corps, the intergalactic police force which leads to Nova gaining his superhuman abilities. Nova/Richard Rider first made his appearance in The Man Called Nova #1 (September 1976). The fictional character was created by Marv Wolfman and John Romita Sr.