Just over a month after iOS 8 was released to the public, the PanguTeam has released an iOS 8.0 - iOS 8.1 jailbreak for all iOS 8 devices.
Oddly enough however, Cydia is not yet bundled in with the jailbreak utility. But the team has said that Cydia will be included in a future update to the tool.
Just like the iOS 7.1 jailbreak, the tool is currently Windows only and Chinese language only. The team had said that English and Mac support are coming soon.