The next major addition coming to OnePlus phones with OxygenOS 12 is a theme store. OnePlus confirmed the news in an official forum post which laid out a few details of the upcoming OnePlus Open Ears Forum (OEF) set for May 18. OnePlus plans to discuss its upcoming OxygenOS 12 additions with a group of 15 users and several OnePlus community member s. The OnePlus Theme Store is still up for debate though it seems a majority of the OnePlus forum members are supportive of the idea. OxygenOS 12 will be based on Android 12 (codenamed Snow Cone) and is expected to arrive later this year...
Source: https://www.gsmarena.com/oxygenos_12_to_bring_its_own_oneplus_theme_store_-news-49000.php