I don't know why it's difficult to get information about the new route of the 171 Bus. The University's website concerning the routes they subsidize, as far as I can tell, is http://facilities.uchicago.edu/transpparking/transportation/index.shtml and that page has no links (at this time) to any useful information about the Autumn changes. A week ago, I e-mailed firstname.lastname@example.org asking about the changes and where I could go for information on the web about them. I got an autoresponse that a key person there would be out until the 24th. It's now the 28th and I've still heard nothing.
The CTA website has no map of the September 6 changes (that I could find), but they do have this description:
Weekday service will operate approximately every 10 minutes during rush periods and every 30 minutes middays. Everyday, southbound service will end at 6pm and northbound service will end at 6:20pm. Service will operate via 53rd and Lake Park instead of to 54th/South Shore Drive.
Back in the golden days of yesteryear, back in the early oughts, you could count on the University to outdo the City of Chicago for communicating with the neighborhood. Now, even the CTA is more informative.
The phone number for the University department that includes transportation is Facilities and their number is listed as 773-702-1700. Y'all are welcome to report back any information you find and I'll pass it along, but I'm not phoning them.