The release of the new iOS 7 jailbreak did very little good for users with A7 devices. The A7 devices include the iPhone 5S, iPad Air, and iPad Mini Retina display. These devices have 64 bit processors and require different kind of coding to run the tweaks.
Saurik has released the new Cydia Substrate(aka mobile substrate) today. So now developers can focus on updating their tweaks to run on all devices.
Watch the video below for a look at the new substrate update.