HTC One X+
Like the HTC One X, the HTC One X+ won't be getting Android 4.4 KitKat. Yes, the phone is newer than the HTC One X but all indications point to this phone sticking on Android 4.2 Jelly Bean, or at the very most, getting Android 4.3 Jelly Bean. Android 4.3 Jelly Bean is also unlikely.
The AT&T HTC One X+ is still missing in action and given HTC's strict adherence to Google's 18 month rule, this is an update that is dead in the water.
We suspect that the HTC One EVO 4G LTE , which isn't getting Android 4.3 Jelly Bean until next year, is in the same boat as these two devices. The Droid Incredible 4G LTE likely is as well.