Good news for anyone eagerly awaiting news about jailbreak the iOS 8.x, the Pangu Team has released a jailbreak for iOS 8.0 or iOS 8.1 for all iDevices compatible iOS 8.x even the iPhone 6 and iPhone 6 More .
According to the Pangu site,jailbreak iOS 8.x compatible with all idevices
Iphone 6, iPhone 6 Plus, iPhone 5s, iPhone 5c, iPhone 5 et iPhone 4s
iPad Air, iPad 4, iPad 3, iPad 2
iPad Retina, 1st Gen iPad mini
iPod Touch 5 Gen
Pangu will be the first jailbreak iOS 8 for iPhone 6 and iPhone 6 Plus is on sale since last month. It is currently only available for Windows but do not worry about the Mac version will be available soon.
Warning: please note that this version is currently in development and is designed for developers and those who know a minimum and does not install the Cydia app directly.
Edit 10/23/2014: You can install Cydia via this tutorial, Saurik has updated Cydia yesterday for compatibility with iOS 8.x
You can download Pangu jailbreak for iOS 8 - iOS 8.1 from this link Click Here
Why Cydia is not installed after the jailbreak iOS 8.x
Because of the many changes in the system with iOS 8, Cydia and many dependencies can not be used in iOS 8. Developers need a plug-in such as basic and SSH to jailbreak iOS 8.X Pangu version 1.0. Cydia developers need to change their code, then the program will be integrated Jailbreak Cydia .