It was announced today that NetBeans 7.0 has been released and is available for download. This release of NetBeans includes Project Coin support, GlassFish 3.1 support (embedded with the "Java EE" or "All" download bundles), Maven 3 support, JUnit 4.8.2 integration, HTML5 support, and new PHP support. In the enterprise Java space, NetBeans 7.0 provides "improved support for CDI, REST services and Java Persistence."
There is no Ruby on Rails support built-in to NetBeans 7.0.
Other coverage of the NetBeans 7.0 release is available in Oracle Have Released NetBeans 7.0 with Support for the JDK7 Developer Preview and HTML5, NetBeans 7.0 Adds JDK 7, HTML 5 Support; Drops Ruby on Rails, Oracle Announces NetBeans IDE 7.0 with Support for JDK 7 Developer Preview, and Java 7 and NetBeans 7.