OnePlus has started the incremental rollout of the OxygenOS 4.0 update for the OnePlus 3 and the OnePlus 3T. Along with updating OxygenOS, this update will also bring Android 7.0 Nougat to both devices. The list of improvements to look forward in this update include: New Notifications Design New Settings Menu Design Multi-Window View Notification Direct Reply Custom DPI Support Added Status Bar Icon Options Improved Shelf Customization The update will roll out to a small percentage of the users first and then to everyone. Source 1 Source 2
Source: http://www.gsmarena.com/oxygenos_40_with_nougat_rolls_out_for_the_oneplus_3_and_3t-news-22476.php