Check out the poll on the right of the [url http://forums.oracle.com/forums/forum.jspa?forumID=1000&start=0]JavaFX General forum page, and the suggestion launched at New JavaFX 2.0 forum
Opinions can also be posted in this thread.
On the one hand I say yes because the number of JFX2 questions are really exploding; on the other hand I say no because there are also no forums for for example specific EJB versions or JSF versions. In fact when I suggested it about EJB technology in the past I got mostly disapproval.
I pose this question: when JFX2 becomes final, will JFX 1.X questions still come at a regular basis? Judging by how JavaFX develops I'd say most people will migrate and so a split forum is again a waste of space.