Xiaomi today released (for the first time) Global MIUI 6 beta ROM for Redmi 1S. MIUI 6 is huge update which was only available for Flagships like Mi4, Redmi Note, MiPad, Mi3, etc. But Xiaomi now rolled out this update for 1S as well. However, Redmi 1S users were able to download the Developer ROM based on MIUI 6 but only in China. Finally, other users around the world can also download it now.
Please note, MIUI 6 Beta is not available over OTA. So, you must download it manually and install it. As being said, it is a huge update bringing you several new features and complete new UI. It brings all new notification center, smart blocklist , visual menu for voice service calls and lots more. This ROM also has some bugs (being in Beta) such as battery drains quickly after reboot and Phone sometimes face difficulty connecting to network after reboot.
However, Xiaomi updates Beta builds every 1 to 2 weeks. So, these issues will be solved very soon. If you are Redmi 1S user, you must download and install MIUI 6 Beta to get new features. As you need to flash it manually, follow the step by step provided on Forums.