I asked Geertjan Wielenga about a possible JavaFX rewrite of NetBeans
back in March, and he said that although they'll keep pulling in JavaFX
features such as WebView on a case-by-case basis, a total rewrite is not
going to happen. So the IDE is going to remain Swing-based.
Link to the Twitter conversation:
https://twitter.com/ChrisNahr/status/441259645949464576
PS: I already sent this reply from another email address (not the one
that's subscribed to this list) but that was two days ago and it's
apparently been lost in moderation. Apologies if it appears twice.
