I found several confirmations on the internet. One tower appears to be at WSU, and another either in SW, or perhaps NE by City Airport. While my computer is running fine exclusively on the 4G network, my EVO doesn't pick up the signal as easily, though on the second floor, I get a bar or two. We have our hotspot on the second floor, which may explain why the computer is picking up a better signal. Here are a few links confirming the 4G launch.

http://community.sprint.com/baw/thre...art=0&tstart=0

http://www.howardforums.com/showthre...roit-Sprint-4G

Here is a map of the coverage area, though it seems a bit optimistic based upon my signal strength.

http://sensorly.com/Map/4G/USA/Sprin...etroit%2C%20mi