If you’ve got an AT&T version of the HTC One X, and you’re just dying for a software update, you should be happy to hear that an official HTC RUU has been leaked and is ready to download. This brings the software version of the One X up to 1.85.502, although it’s important to keep in mind that this update is currently unreleased; this simply means that AT&T and/or HTC may have slightly different software available by the time they’re ready to send this out as an OTA update.
However, if you’re brave and you don’t mind breaking any root that you have on your phone, you can download the RUU to your computer and install it right now. Speaking from experience, RUU updates are really easy to apply: all you have to do is plug your phone into your computer, run the .exe file that you downloaded, and wait about ten minutes for everything to finish flashing to your phone.
There’s no official changelog quite yet, but do let us know if you discover anything different after applying this update.