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 updateslsquo;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.