LibreOffice 3.4.1 has been released for all platforms.
“LibreOffice 3.4.1 fixes several bugs that affected the previous version, and can be safely deployed for production needs by most users.” ~ Document Foundation
LibreOffice 3.4.1 can be downloaded in .DEB installer format for Ubuntu from the official website at libreoffice.org/download.
A LibreOffice PPA is also available for Ubuntu users, however it is yet to be updated with the 3.4.x series.
The latest version of LibreOffice available from the Ubuntu Software Centre is LibreOffice 3.3.2.
The next release in the LibreOffice 3.4.x series is due late July.