From Fedora Project Wiki
Eclipse
This release of Fedora includes Fedora Eclipse, based on the Eclipse SDK version 3.4. The 3.4 series of releases has a "What's New in 3.4" page , and release notes specific to 3.4 are also available.
Some of the noteable features in 3.4 include a number of improvements in handling bookmarks, easier ways to find and install plug-ins, and additional help with refactoring.
Upgrading from Fedora 9
Users upgrading from Eclipse 3.3 will need to migrate their plug-ins. See the Plug-in migration guide.