From Marvel Studios News:
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Marvel Studios has cut their 2020 release slate from three films to just two. The studio has removed the July 31, 2020 release date for an untitled film from their schedule. Marvel still has untitled films set for release on May 1 and November 6 that same year.
This is undoubtedly the Guardians of the Galaxy Vol. 3 effect. The film was (unofficially) intended for a May 1, 2020 release, but was put on hold indefinitely after writer-director James Gunn was fired.