The JDNC markup looks like a great start. I really hope that efforts are focussed on making it workable and extensible.
The API alone is nice, but it will get lost amongst the noise without the markup.
* More documentation on markup !
* More info on how to mix markup with API
* How to write custom tags/add to the markup doco and tutorial
* simple ways to plug in beans/event handlers (configure in markup only, no API interaction)
* simple ways to perhaps link markup generated forms together (via a popup?) - hyperlink style.