So unless The Suicide Squad is keeping Manta as a surprise, then it will be a longer wait for him to crossover over to that area of the DCEU, assuming that’s even an option.
The James Gunn-written and directed DC movie is scheduled to begin production this fall, and while a variety of new recruits have already been reported to appear, including Polka-Dot Man, Ratcatcher, Peacemaker and King Shark, there’s been no mention of a Black Manta appearance.