I haven't found anything more than what other people have already said about Detroit. Although it's not too far from Chicago, and some of the Bug City stuff could have seeped into Detroit. But really, a lack of current canon on Detroit can be a bonus because very little you make up will be contradicted by the existing meta. That's one big reason I chose Detroit as the setting for my current SR campaign.
Three big things about Detroit (forgot earlier and am editing this): 1) there's a wall separating the city proper from the outlying areas (I don't remember the actual name, I just call it The Barrier Wall), so I've made flying drones harder to get because Ares has the Barrier Wall partially to keep to riff raff out; 2) cheap, reliable public transportation called the People Mover is available everywhere in the city, but it has security (not sure if it's supposed to be Knight Errant but I usually use come off brand rent-a-cop Ares subsidiary), and 3) it's a corp city, so Lots of advertisements and targeted marketing based on what the characters have bought over the last couple gaming sessions - I make up an ad sheet for every player in the group for every gaming session, some is generic, some is not (as per targeted marketing) and some is news stories since one character is always watching the news in his down time. An example of one of these ad sheets is below (if I can figure out how to attach it).
