You can expect more updates on both the Shazam and Black Adam movies in the foreseeable future, now that their development is picking up momentum.
The expectation has long been that Shazam will be comparatively lighter and more kid-friendly compared to the first three installments in the DCEU (ie.
Shazam, for those unfamiliar, is a character with several decades of DC comic book history behind him and was once even known as Captain Marvel, no less.
Gayden, as it were, reads as being a screenwriter who can also deliver the right tone for a Shazam movie; giving it enough of a darker edge (a la his work on Earth to Echo) so that it feels at home in the DCEU.