From Batman News:
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“No, I haven’t spoken to DC. John Stewart, the character, is amazing. When I had the opportunity of potentially being John Stewart, when we were working, I learned how he was part of the Green Lantern Corps and all that he was doing. He was kind of community-driven so I felt like, ‘Oh, man, I love this character,'” said Common, who you may recall made a cameo as a criminal in last summer’s Suicide Squad movie.
“He used his mind to do a lot of things so I connected with him. I just love the character, but I don’t know, I haven’t talked to DC about it but, you know, hey! Yeah, I would love [to]. That would be an honor to play John Stewart.”