I'm pretty sure that we won't be seeing a lot of in-depth tutorials on Swift for the rest of the year, so until then you can try and rely on these resources:

http://codecondo.com/communities-for-swift-developers/

http://codecondo.com/learn-swift-programming-for-ios-app-dev...

http://codecondo.com/the-complete-ios8-and-swift-course/

I hope it helps.

I used this:

https://www.udemy.com/complete-ios-developer-course/

Some of the lessons have become irrelevant as Swift has been updated but the author does a good job of redoing the videos. I just submitted my first app to the App Store and most of my learnings were from this course.

Pragmatic Programmers has released a book on the iOS 8 SDK that uses Swift.

https://pragprog.com/book/adios2/ios-8-sdk-development