I've just done a fresh install of Slitaz Rolling and I noticed that get-libreoffice now installs LibreOffice 6.0!
Just a word of warning: after sudo get-libreoffice
make sure to do the following:
sudo rm -f /usr/bin/soffice /usr/bin/libreoffice6.0
sudo ln -sf /usr/lib/libreoffice6.0/program/soffice /usr/bin/libreoffice6.0