What is Apple hiding with iOS 11.4

INSUBCONTINENT EXCLUSIVE:
Have you installed iOS 11.4 Once you&d looked at AirPlay 2and Messages in iCloud, did you happen to take a look at the contents of the
security updates‘Details available soon& If you did you&ll have been disappointed.Apple hasn&t disclosed details concerning the security
content of the new software
It hasn&t revealed anything concerning USB Restricted Mode, which apparently makes it harder for people to hack into your device.