Griffon uses Swing underneath, so I guess it should support JavaFX 2 components/APIs out of the box? Or is there some work arounds to be used for supporting JavaFX 2.
If GroovyFX and Griffon can coexist then we can use GroovyFX for JavaFX 2 support.
This is something that Dean Iverson (@deanriverson on twitter) can answer with full disclosure as he is the one working on a JavaFx 2.0 plugin for Griffon.
In short, yes it's possible to use GroovyFX and Griffon together but I can't say any more yet as I don't want to steal Dean's thunder.