Its Second Firmware Update for the HTC One X. Version 1.29.401.7 is being pushed out today to users in the UK and while we don’t have a detailed changelog, Its about 35MB and is being pushed out now to unbranded, unlocked European One X phones. Update addresses color temperature issues and typical bug fixes.
International One X users, head to Settings > About > Software updates to begin your update to version 1.29.