JavaFX 2.0 Early Opinion
My friend and co-author, Jim Connors, posted a recent blog entry about his early opinion of the upcoming new JavaFX 2.0. In summary, JavaFX 2.0 will provide a universal Java API accessible from any JVM-supported language (i.e. Java, JRuby, Groovy, Scala, and so on), and will no longer support JavaFX Script.
Other benefits to this move are improved performance (especially with the new Prism graphics engine), Swing interoperability, and a better development and debugging environment.
You can read more about the new JavaFX 2.0 roadmap here.