Yesterday NetBeans 6.7 was finally released. There was no significant improvement since in Groovy area since my last post as we were in stabilization period. You can see the complete list of new features in New and Noteworthy document for 6.7.
Unfortunately there is one defect in the new Parsing API influencing integration of Groovy into Java (the opposite way is ok). This will be fixed in a patch that should be released in couple of weeks. Fix is already present in trunk build.