There were some delays, but HTC's last-generation flagship device is getting the bump up to Android 4.2.2. Yes, AT&T has approved the OTA for its version of the HTC One X. Sadly, this will be the last new version of Android it sees. It's better than nothing, though.
HTC AT&T One X customers - We have received Technical Approval for the MR with Sense 5 + OS 4.2.2. The OTA is targeted for 1/29.