Cydia has been updated for iOS 7.
Cydia has a new iOS 7-styled look. Everything is updated to fit the new design. Cydia, for those unfamiliar, is an app store installed on jailbroken phones that allows users to purchase and install apps that have not been approved by Apple.
As you may know, there is now an iOS 7 jailbreak available. There are reports that the software is a bit buggy. Also, if you have Chinese set to the main language on your iOS device, you will receive TaiG instead. This caused several problems, and you can read about some of it here.
That said, the standard installation with Cydia seems to be safe. Just buggy.