Earlier today we heard that Samsung might be preparing to issue another update for the Galaxy Note7 units that still haven't been returned. Unlike the last one, which limited charging to 60%, this one would essentially render the phone useless, since it wouldn't be allowed to charge anymore. At all. It turns out that this was true, only the date of the rollout was wrong. It is officially happening, just not from December 15. Instead, the update will be sent on December 19. What this software release does is, in Samsung's own words, "prevent U.S. Galaxy Note7 devices from charging and will...
Source: http://www.gsmarena.com/its_official_note7_units_in_the_us_will_stop_charging_on_december_19_except_verizons-news-22092.php