Postponed to 2nd Julyhttp://en.miui.com/thread-3017344-1-1.html
MIUI 10 China Developer ROM 8.6.28 full changelog
System
Fix - Bluetooth audio in vehicle on the Honda civic (06-28)
Lockscreen, Status Bar, Notification Bar
New - PIN can contain 4-16 digits now (06-26)
Fix - Notifications weren't divided into important and unimportant on Android N (06-27)
Fix - 4G+ icon wasn't displayed (06-27)
Fix - H+ icon wasn't displayed for HSPAP networks (06-27)
Can't wait for new weekly
https://xiaomi.eu/community/threads/8-6-28.44673/