I took a quick look at how the ANTLRWorks 2 project is getting on... and discovered that today, March 23, the new early access preview 10 has been released:

http://www.antlr.org/wiki/display/ANTLR4/1.+Overview

Downloaded it immediately and was impressed when browsing through the Java.g file that I also found on the Antlr site:

(Click to enlarge the image above.)

On the page above, the following enhancements are listed:

• Add tooltips for rule references
• Finally fixed the navigator update bug
• Major improvements to code completion
• Fix legacy mode
• Many performance and stability updates

I've blogged before about how the developers on the above project consider their code completion to be "scary fast". Some discussions have taken place about how code developed by the ANTLRWorks team could be contributed to the NetBeans project, since NetBeans IDE and ANTLRWorks 2 are both based on the NetBeans Platform.