OpenOffice.org releases a new version every three months, and every other version has new features. OpenOffice.org version 2.4 is due March 2007. Unlike version 2.3.1 (due December 4), version 2.4 will contain new features. The 2.x.1 releases are bug fixes only.
Here is a nice description of framework features in OpenOffice.org version 2.4.0. Impress will gain a presenter view. List of all features and enhancements targeted for OOo 2.4. Here is a short subset of that list is issues with 3+ votes and a short list of new features.
Did you know you too can add up to 2 votes per issue after you register for an account in the Issue Tracker?
OpenOffice.org version 3.0 is due September 2008 and will include many cool new features (short list, long list). As they get closer to the release, these links should become better defined.
In the meantime, you may wish to test OpenOffice.org 2.3.1 release candidate 1 before its final release December 4.