LibreOffice 3.4.0 has been released about two weeks ago, but it was intended for power user and contributors. It's not yet encouraged for enterprise or corporate users and it will be likely so when 3.4.1 is out in the future. At that time, all LibreOffice 3.3.2 users has no update at all, but that has changed as of yesterday, as LibreOffice 3.3.3, the third release for 3.3.x series has been released by the developer team.
If you look at the Release Note, there's nothing interesting there, but actually there's a lot of bug fixes on this release. They continue to fix all problems that has been reported since the release of LibreOffice 3.3.2, while backporting all bug fixes from Oracle's OpenOffice.org 3.3.0 series.
For list of features in LibreOffice 3.3.x series, please have a look on this page.
If you are interested on testing the new LibreOffice 3.4.0, you can check the list of features here.