If you've got a Samsung Galaxy Note 10.1 2014 (or SGN1012014, as I like to call it) on T-Mobile, you may want to head into Settings > About tablet > Software updates and see if there's something waiting for you. Team Magenta started pushing the 4.4.4 update out today, which also brings Download Booster along with it. Fun times.
- Update to Android 4.4 (KitKat)
- Download Booster
- IPv6 updates
That's essentially the bulk of it right there.