Tom Harrington with an overview and early opinion on CloudKit. I don't expect Core Data iCloud sync to be deprecated any time soon but I do believe its days are numbered. CloudKit has less magic, more control and while that will require more code on our part, we learned a long time ago that there is no magic bullet for sync.
It's rare that anyone outside academia ever gets to work on a new language without the baggage of at least some kind of compatibility. Swift is certainly no exception to that rule as Objective-C compatibility is essential and it has affected the language design significantly. Chris Adamson elaborates.
Operator overloading in Swift allows this new experimental Auto Layout library from Robert Böhnke to work. I find this interesting mainly because this is starting to show some of the advantages of Swift over Objective-C. I think we'll all be watching closely to see how the Apple framework teams handle things like this and at what point new Swift only syntaxes get introduced.
Generics are a big part of Swift and Andrew Hulsizer takes us through what they are and how to use them. You'll want to pay close attention to this if you haven't used a language which includes Generics before.