Xiaomi's HyperOS 4 brings one of the company's biggest interface redesigns yet, but getting the update doesn't necessarily mean your phone will receive every new visual effect.At the centre of the redesign is Soft Light Glass, a new interface treatment that uses transparency, lighting, depth and glass-like effects across parts of the operating system.The HyperOS 4 beta rollout has already started in China, with Xiaomi releasing the update in multiple batches across selected Xiaomi and Redmi.