No! No one has submitted their Swift app in the Store, because it’s not officially released yet, as you yourself mentioned.
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.
solved Has anyone been able to submit Swift apps to the App Store? [duplicate]