There is another thread (here: http://forums.windowscentral.com/htc-8x/212854-january-16th-8x-update.html) about this update, but you have to read a few of the posts until it becomes evident that AT&T has released the Portico update for the 8x.
I installed it this am. I can confirm it is definitely Portico as I have SMS drafts and new WiFi settings.
I installed it this am. I can confirm it is definitely Portico as I have SMS drafts and new WiFi settings.