Today when I was playing around with the HTC One X , an OTA update popped up on the screen. This is the 1.28.720.10 update which was rolled out in Europe recently. This update is expected to fix the battery life woes of the Quad Core phone which is by far the best Android device money can buy at this point of time.Once you get this notification, you can download the update over 3G or WiFi and install it. It takes a while and you will be running on the latest version of software.
Seems like the kernel and baseband versions have changed indicating that the radio performance might have been tweaked to conserve battery.