UPDATE (12/23/13): Evasi0n 7 has been released for all iOS devices running iOS 7.0 through 7.0.4. You can learn how to jailbreak the iPad Air and other iOS devices here.
There is no official release date for an iPad Air jailbreak, but the developers who created the evasi0n iOS 6-6.1.2 jailbreak are currently working on a solution. Users should be able to jailbreak their iPad Air after an iOS 7 jailbreak is released.
Planetbeing recently tweeted that the team may have "all the pieces" for a future iOS 7 jailbreak, and that it is safe to upgrade to iOS 7.0.3. It only took the evad3rs a few months to jailbreak the iPhone 5s, so we will hopefully see an iOS 7 jailbreak sometime early next year.
Apple closed the last evad3rs exploit with the release of iOS 6.1.3.