I'm betting MM is soon. Many devices get a small patch prior to the main update. My wife's HTC M9 got a very similar patch a few weeks before her MM update.
There is so much jumping to conclusions about the MM update its almost funny. The omly thing we know is that it isnt out yet. The rest of the bloatware, problems, FCC, etc is all wild guessing. Until the update is released we won't have any idea, but there are others who are sideloading what looks to be the official update. Now if they are getting something that isnt the final update, then yes AT&T is still doing work on it.