At the OnePlus 6T launch it was announced that its predecessor would get the Nightscape camera mode as well, this week even. And sure enough, a couple of days ago this was made available through a beta release. Now, just two days later, the stable update is already hitting OnePlus 6 units in the wild. It's labeled OxygenOS 9.0.2, and aside from the new camera mode it also packs some other goodies. You get the new navigation gestures that debuted on the 6T, the improved UI for the About phone section in Settings, optimized standby power consumption, as well as the November 2018...
Source: https://www.gsmarena.com/oxygenos_902_is_rolling_out_to_the_oneplus_6_with_nightscape_and_studio_lighting-news-34026.php