He won't be beating people up, mostly. He'll be killing them. So every racist cop better watch out, for a start. Then the aldermen, the mayor, his business partners... Nighthawk is supposedly going to be feared by criminals and police alike. And in his civillian guise he'll be pushing through social reforms and aid programs. And he has all of Chicago to play with. The Blue Wall will get torn down with blood. It should be hardcore!
At least, that's how I read the interviews about the book.