LibreOffice 4.0.0 is released and you can download the installation file from LibreOffice site. Two files are to be download:
LibreOffice_4.0.0_Linux_x86_deb.tar.gz (170 MB)
LibreOffice_4.0.0_Linux_x86_deb_helppack_en-US.tar.gz (9 MB)
Before proceeding, first uninstall the existing LibreOffice installation via terminal, by:
sudo apt-get remove libreoffice*
Now go to the downloaded files.