After releasing the OS X 10.10.1 Yosemite beta, Apple issued the iOS 8.1.1 to developer with bug fixs, that's mean launching the iOS 8.1.1 is soon. iOS 8.1.1 beta is classified as build 12B432, and the description the Apple mentioned that this update will improve the operating system.

Notably, Apple is focus on adding the metric in mmol/L into the app of HealthKit, so the Health app doesn’t allow to be used to the public. However, Apple released iOS 8 this year, and because of the bug of HealthKit, so iOS 8.0.1 appeared to the users to fix the bug. But then, some users found that it is disable to use Touch ID for the iPhone 6 and iPhone 6 Plus, that's why Apple finally issue iOS 8.0.2 to solve the problem quickly.