Instead of getting updated to Android 4.1.1, the HTC EVO 4G LTE received a minor bump to Android 4.0.4. At the same time, the unit also was updated to HTC's latest build of Sense, 4.1. For those who take note of such things, the new software version is 2.13.651.1.710RD and comes with the usual bug fixes.
Owners of the HTC EVO 4G LTE shouldn't despair. Although HTC has certainly been inconsistent with its updates this year, we feel fairly certain that eventually your phone will be running Jelly Bean.