The update was reported earlier this morning on our Android Central forums. T-Mobile's support site has also updated its Galaxy Note 4 and Note Edge pages with the new software versions. Depending on which Note 4 model a person has, they will either see a 309.9MB download to version N910TUVU2EPG2, or a 281.27MB update to version N910T3UVU2EPG2. Note Edge owners will see a 328MB download to version N915TUVU2DPG2. As with all OTA updates, it may take a few day for it to circulate to all owners of those phones.
Thanks again to Android Central's forum members for the tip!