I looked at this book but it was too general.  I actually just watched the new HTML5 Now video on Creative Edge.  Its the best hour I have spent on this.  Its a 3 hour video, pretty basic, but I say 1 hour because I was able to skip over the remedial stuff and get to the parts that were meatier.  I recommend it especially the section on new UI elements.

http://www.creativeedge.com/9780132480543