Android 4.3 sense 5.5 topic

HTC One S upgrade to Android 4.3 sense 5.5 custom rom but why HTC One X not upgrade to Android 4.3 sense 5.5....
HTC One X latest device compare to HTC one S and one S dual core and one X quad core ........:confused::confused::confused:
Anyone help why not our great devs working on it....