I keep my wifi turned off to help on battery, I saw this post and did a manual search for the update and it was there. After that I kept getting popups about downloading the update and I kept pressing remind me later. I decided to go ahead and download the update this morning when I got to work and as soon as I turned wifi on and it connected it started downloading the update without me selecting anything. So for those of you who keep your wifi on, that's probably why it automatically started downloading even though you told it to remind you a few times. I don't think it will do it over 4G so as soon as you enable wifi it's game on. It's been going for about 30 minutes and I'm at 34% of the download, I did remove my micro SD card prior to the download just to be sure nothing happens to the files on it. I'll probably go ahead and wipe the cache in recovery mode afterwards and reboot just to help ensure everything runs smoothly.