MIUI 13 Update Download (Early Access) available on Google Play, but not exactly what you'd expect
A few months ago, some rumors concerning the development of MIUI 13 surfaced online. However, it seems they were only rumors and nothing's official yet, although it is rather safe to assume that Xiaomi will release the successor to MIUI 12 next year. Starting with MIUI 5, which was released back in March 2013, Xiaomi came up with a new major update for its Android-based operating system each year, although some versions took more than 12 months to come out and others — such as MIUI 12, which arrived in less than 7 months.
An app that surfaced on Google Play at the end of June claims to provide access to MIUI 13 and we strongly advise you not to fall for it. Released by Madhav Developers, a company that only has a Gmail address and a website under construction, MIUI 13 Update Download (Early Access) seems more like a placeholder for ads, nothing more.
Until now, the app has been installed by over 100 people but has no reviews or ratings so far. It is simply amazing how both Google and Xiaomi missed its existence and allowed it to stay on Google Play so far. The screenshots on the Google Play page of the app show what appear to be links to MIUI 12 builds — for example, the so-called "MIUI 13" for the Xiaomi Mi 9 SE OTA download screenshot shows 20.4.27 as its build number, which is a rather old MIUI 12 beta (more details about older MIUI 12 beta builds can be found on this page).
Madhav Developers also has an app called MIUI Custom ROM on Google Play, which seems to be nothing more but a ROM library-style app that provides links to various ROMs for Xiaomi handsets, including Resurrection Remix, LineageOS, RevengeOS, and so on.
Since MIUI 13 Update Download (Early Access) is nothing more but a misleading name for an app that doesn't deliver what it promises, feel free to report this app to Google. MIUI 13 might be in development, but public testing has not begun yet. As soon as that will happen, we will be sure to let you know.