As Marvel Studios readies its post-Avengers 4 lineup, the studio has hired Wonder Woman 1984 screenwriter David Callaham to pen an unannounced film.

In addition to the Wonder Woman sequel, Callaham has several upcoming films he has written for including the Mortal Kombat reboot and Zombieland 2.

RELATED: Report: Disney's Scarlet Witch TV Series Will Co-Star Another Avenger

The new project is not Callaham's first collaboration with Marvel Studios, having performed uncredited rewrite work on 2015's Ant-Man.

While details on what exactly Callaham is working on is still being kept under wraps, it is reportedly not expected to be The Eternals, Black Panther sequel, or Black Widow solo film as all three projects are far enough along in development to not require an extensive rewrite. It also has been confirmed that Callaham is indeed working on a feature film and not a Marvel Studios miniseries for Disney Play like the Scarlet Witch solo series and the just announced Winter Soldier/Falcon team-up series.

RELATED: Avengers 4 Rumor Points to Possible Title, November Trailer Release

This leaves the possibility that the long in-development Doctor Strange sequel could feature Callaham as a co-writer with returning director Scott Derrickson, an extensive rewrite of Guardians of the Galaxy, Vol. 3, or an entirely new property. Whatever it may be, the studio's future plans should become more visible following the release of Avengers 4 in May.

(via That Hashtag Show)