Sprint has started rolling out Marshmallow update to Samsung Galaxy Note Edge and Galaxy S5 Sport units on its network. The update brings Android version 6.0 to both devices. The Note Edge update also includes latest Android security patches as well as some other bug fixes. The updates are being rolled out in phases, with the Note Edge process completing on May 2 and the S5 Sport process wrapping up on May 11. In case you haven't received the update notification yet, you can also manually check for the update by heading to the Settings menu on your handset. Source 1 2
Source: http://www.gsmarena.com/sprints_samsung_galaxy_note_edge_and_s5_sport_start_getting_marshmallow-news-17892.php