I have a Galaxy S3, and my carrier is AT&T. Last Thursday, the phone was persistently and annoyingly nagging me about a new (and apparently significant) update.
I was on travel and didn’t want to upgrade my phone in the airport, so I kept canceling the update. I let it update in the hotel that evening.
Some of the phone pages changed. But one thing that is apparent is that my battery life has dropped significantly. I could usually rely on the phone to go from 100% charged down to 40% or so after a day of use, but the past couple days, it has plummeted south of 20% (today, by 1545). So something Ma Bell has done isn’t good.