I just applied the MultiView Update from AT&T. Although its advertised as "OTA" - just to be clear, it requires a Wi-Fi connection to install.
Good so far.
After I first checked the availability of the AT&T Update on my Note2 at 7:00pm this evening pacific time, I actually declined to update. and then after some time researching online with my main PC, later I was able to successfully install the update after it requested I connect to a Wi-Fi network.
It took about 15 minutes for the update to download, then it prompted for a reboot, then it took about 5 minutes to apply the update, and (may be coincidence) several of my 145 installed Android apps were updated to be compatible with Android 4.1.2