Apparently, a second visit to the FCC was made, this time by model number GT-i9205 and this time, the version of the large-screened Samsung Galaxy Mega 6.3 that appeared did contain an LTE radio. But for those in the states, don't get too excited yet. The device supports LTE band 5 (850MHz) which is not in use in the U.S. Besides the LTE radio, the device contained dual band WiFi, NFC and GSM 850 / 1900 connectivity.
source: FCC via Engadget