Cydia app store creator Jay Freeman (@saurik) announced today that "Substrate version 0.95000 is now compatible with both iOS 7 and the ARM64 CPU used in the iPhone 5s." This means all the recently released iOS 7 tweaks and future Cydia releases will now work with the iPad mini with Retina display and the iPad Air.
The update comes after the evad3rs released evasi0n 7 for iOS 7 devices. Up until now most jailbreak tweaks did not work with Apple devices equipped with an A7 chip, but now that has all changed.
Several popular tweaks such as Zeppelin have been updated to support Apple's latest firmware, and new tools like iOS 6 icons for iOS 7 and NCAllOnly allows jailbreakers to tweak the looks of their iOS 7 devices. You can find all these new tweaks and themes alongside the Substrate update in the Changes section of Cydia.
You can learn how to jailbreak your iOS 7 device by following these instructions.