A month after it debuted in China, MUI 12 has made its way to the global scene and will be available in beta form as early as next week. Xiaomi's latest custom UI brings revamped visuals, improved dark mode and better privacy controls among other things. MIUI 12 also brings stock Android 10 navigation gestures, new quick reply feature, floating windows and a new universal casting feature that supports Miracast standard. It's scheduled to begin seeding to Mi 9, 9T, 9T Pro and K20, K20 Pro users by the end of June. A second, larger batch of phones is expected to get MUI 12 soon...
Source: https://www.gsmarena.com/miui_12_goes_global_supported_device_list_available_-news-43294.php