We've been hearing whispers that an update has been in the works for the AT&T version of the HTC One X, and this morning an RUU has leaked its way out. There's no real changelog, of course, though folks are noting a new radio and possibly improved Wifi performance (which is one of the features we'd heard was being targeted). The RUU takes the software version to 1.85.502.3.710RD, up from 1.73.XXX.
One thing to be aware of -- and which is strangely not mentioned in the source post -- is that this is a full RUU, which means if you run it, you're wiping the device. So keep that in mind if you're thinking about giving it a go. And do remember that this is all unofficial stuff, and no telling if it's actually the update that will be pushed by HTC and AT&T. But if you've just got to get your flash on, hit the link below to give it a go.