Xiaomi has been doling out info about the Mix 2s, building up to the March 27 unveiling. The latest is two images of clapping hands, with vague text teasing new camera features. An earlier hand-based teaser was for the Snapdragon 845, could the two be related? The chipset supports AI camera enhancements (there's a teaser image for that as well), though clapping suggests speed. Maybe 4K at 60fps is considered fast or (more likely) the 720p at 480fps slow-mo feature. Clap for the AI-powered camera of the Xiaomi Mi 2s Or maybe it's about the speed of the autofocus? A leaked ROM...
Source: https://www.gsmarena.com/xiaomi_teases_mix_2s_camera_with_clapping_hands-news-30065.php