I hope that OpenOffice.org 2.4 will be released within a few days. It was originally planned to be released about two weeks ago, but it was unfortunately delayed by a few late discovered faults.
While we are waiting, we can just as well look forward against the next major release, witch is 3.0 planned to be released in September 2008.
You can find a good and relatively detailed walk-through demonstration here: http://www.oooninja.com/2008/03/openofficeorg-30-new-features.html
You can download an early developer snapshot here: http://ftp.linux.cz/pub/localization/OpenOffice.org/devel/DEV300/
What happened to 2.4.1 in the plan ?
Usually we find a bug-fix release between the major releases and the plan is open for that, but at this moment there is no specific plans for a 2.4.1.