Looks like the folks from Jetbrains, makers of the popular Java IDE IntelliJ IDEA are working on a framework for GWT called GWT Jet. From the original poster on the newsgroup:
Main idea is separate layout and styling from program logic and code it on HTML vs. Java. It seriously decrease time for development of static part of content compare with hard-coding.
They’ve created a sample application at http://www.jetbrains.org/gwtjet/JetApp.html. It includes a simple Getting Started and all the source. Unfortunately I don’t see much other documentation. Anyway, try it out.