That'd be a neat something, wouldn't it? But no, I don't think so. DC is considerably more likely to confirm Dick Grayson as Bi. And as it currently stands, they're much happier just queerbaiting by using Grayson as an icon; that way, they pander to his fandom who already headcanon his bisexuality while remaining noncommittal and no-homo for those they'd fear isolating. If they can't even work up the courage to confirm Dick's bisexuality, there's no way they'd be able to begin mustering up the nerve to confirm Bruce's.
(And no, I don't think Bruce should be taking up a spot there, even if he isn't directly centered. He's not LGBTQIA+, so he shouldn't be on a cover celebrating LGBTQIA+ characters. Same for the queerbaiting Dick Grayson/Nightwing.)