While giving the AT&T HTC One X's firmware a look over, I ran across a a vulnerability that would allow us to gain root access. It turned out not to be all that useful at the time, as another root was released the same day. With the latest 1.85 firmware leak, the previously published root has been fixed, making the one I found earlier useful once again.
This vulnerability happens to be in carrier bloat - specifically an app called ATT Ready2Go (also know as dashconfig), which is shipping on many new AT&T LTE devices. ATT Ready2Go is the essence of bloatware, and really provides little-to-no additional benefits that aren't already available in Android.