I don't understand this comment, seems quite random.
The comic features 'replacement' superheroes (Artemis/Wonder Woman, Mon-El/Superman, Eric Masterson/Thor, Azrael/Batman, USAgent/Cpatain America, Red Hulk and GL Guy Gardner) and 'racial diversity,' 'replacement' superheroes Steel/Superman, Ultimate Nick Fury, Mr Terrific and GL John Stewart who were all black guys replacing white guys as well as Cassandra Cain/Batgirl (Chinese-Caucasian), Connor Hawke/Green Arrow (Caucasian, Asian and African) and Miguel O'Hara (Caucasian-Hispanic). Most comic-book fans would find Miles-Morales (the new biracial Ultimate Spider-Man) old hat and merely shrug it off.