Does anyone know when Swift apps can be submitted to the app store?
From Apple website:


  You can begin using Swift code immediately to implement new features in your app, or enhance existing ones. New Swift code co-exists along side your existing Objective-C files in the same project, making it easy to adopt. And when iOS 8 and OS X Yosemite are released this fall, you can submit your apps to the App Store and Mac App Store.


ref: https://developer.apple.com/swift/