It looks like NetBeans is no longer interested in supporting the Ruby on Rails community. There won't be any Ruby on Rails in their version 7 release. So what does this mean? Well, it means there's definitely an opening for a competing toolset, or as the JavaRanch Bartender Marc Peabody tweeted: "The NetBeans is dead. All hail @JetBrains!"
Here's the update from the NetBeans wiki page.
"Where is Ruby on Rails Support in the NetBeans IDE?
As of NetBeans 7.0, the Ruby on Rails module is no longer included in the NetBeans IDE. See Community Message.
What options are there for developing with Ruby on Rails?
Developers who still want to use Ruby on Rails functionality in the IDE can do so with NetBeans IDE 6.9.1 or earlier versions of the IDE.
I'm a big fan of Ruby support in the NetBeans IDE; will support return in the future?
Due to limited engineering resources, no further development and support for Ruby on Rails is planned.
However, we strongly encourage our community of NetBeans Ruby users and developers to volunteer to take on development of Ruby on Rails support for the NetBeans IDE.
If you're interested in helping to maintain Ruby on Rails functionality for the NetBeans IDE, please sign up on the NetBeans Ruby developers mailing alias: dev at ruby dot netbeans dot org, or contact the NetBeans team!
The NetBeans Team"