Just to give an update on this thread. I found out the answer to my question on my trip last month. At the Bradley Terminal on 6/17, I observed a MMW at the checkpoint closest to gate 119. It was not in use that evening as the lane to it was closed off.

Right know it appears the TSA is conditioning people to get used to the MMW by making participation optional. I think at some point these body scans will be mandatory and they will be at nearly everyone airport. I hope I'm wrong.