From the announcment:
Work on this release was focused almost entirely on performance. Both startup
time and general UI responsiveness have improved significantly. In addition to
that, several modules, previously available on the Update Center, have been
added to the standard distribution. These modules provide many features,
including support for:
* debugging servlets and applications written with JSP technology.
* creating and editing JSP tag libraries.
* monitoring HTTP requests.
* WAR file packaging.
* connecting to and browsing databases.
Several modules have been removed from the standard distribution but are available
on the Update Center.
NetBeans-IDE is a pure Java IDE.
NetBeans is dedicated to providing rock solid software development products
(NetBeans IDE, NetBeans Platform) that address the needs of developers,
users and the businesses who rely on NetBeans as a basis for their
products.