December 24, 2007 update to this post: The paperbacks of the JavaFX Script book are now shipping.
I have been asked about the availability of JavaFX Script: Dynamic Java Scripting for Rich Internet/Client-side Applications. The book is available as an immediate PDF download at https://www.apress.com/book/view/1590599454, and paperbacks should be shipping soon. The book is based upon the interpreted (current) version of JavaFX. The compiled version of JavaFX Script is still in flux, and when the first milestone release is available, I will quickly update the book. The Apress "firstPress" brand is geared toward this purpose, in that the eBook can be made available quickly, and the paperback is typically "print on demand". I have been involved in providing input to the JavaFX compiler development team, and am currently assisting in the testing efforts, so the process of updating the book for the compiled version should go very quickly.
By the way, the UI libraries won't change much in the first release of the compiled version -- only some of the syntax of the language. Please see the Putting My CTO Hat On post for my company's plans for use of the current (interpreted) version, and the compiled version, of JavaFX Script.
JavaFX Script: Dynamic Java Scripting for Rich Internet/Client-side Applications
Immediate eBook (PDF) download available at the book's Apress site