User blog comment:Jkphantom9/So, Viz Media is releasing something pretty cool soon.../@comment-410526-20160722130250

I'm pretty sure it'll be the official translation of the Manga, because if it were something else, I can't think of a reason why it'd be published by Viz Media (which as someone noted below, is the company that licenses Shueisha's properties in the US). The RvB book was published by HarperCollins. It might contain some extra stuff, I guess, but I think it'll definitely be centered on the manga.