The author works with Microsoft as Technical Evangelist. Why to wait then?
Chapter 1: HTML5 Structure
Chapter 2: Styling with CSS3
Chapter 5: Binding Data to the App
Chapter 6: Making the App Responsive
Chapter 7: Making the App Live with Tiles and Notifications
Chapter 8: Signing Users in
Chapter 9: Adding Menus and Commands
Chapter 10: Packaging and Publishing
Chapter 11: Developing Apps with XAML
I wish we have the second revised version focusing Windows 8.1 specific development discussion.
All the best and happy reading.