The team at RayWenderlich.com recently published two Swift books, with a third on the way:
Swift by Tutorials gets you started with Swift via hands-on tutorials.
iOS 8 by Tutorials, all about iOS 8, explore Adaptive UI, App Extensions & more.
Coming October of 2014, Core Data by Tutorials, code with Core Data using Swift.
Ray’s team does some great work, I highly recommend you take a look.