OMG. Thanks for posting this. This is a terrible idea. Would they have described a white character as a junkie? Look, they established the chunky white kid as the knowledgeable one about the town so why change it now? And why take the black kid, who is the designated outsider who has loose ties to the town and have him stick around and become a library and likely actual junkie? It doesn't flow organically from the characters established in the first film.
I could see the big kid sticking around, learning more. Whereas the black kid should want to get the hell away from Derry and his grandfather and the slaughter business. Really though, I can't see any of them sticking around.