The General manager of HTC North Asia, Jack Tong announced at a press event that the Android 4.1.2 Jelly Bean update will start rolling out for the One X today. He also said that the One S will also be graced with the firmware update, but didn't specify a time frame.
The new firmware update will not only bring the One X to the latest Android release (not counting Monday's Google announcement, of course), as well as the latest Sense UI version.
Jack Tong also mentioned the One X+ and One S SE updated edition, which will hit shelves in Asia on October 30. No other markets were mentioned, but we recon they shouldn't be too far behind the schedule.