Will LibreOffice 3.4 be included in an update?
Solution 1:
LibreOffice 3.4.3 for Natty was released 7 Oct 2011. Consider adding the libreoffice repository:
sudo add-apt-repository ppa:libreoffice/ppa
sudo apt-get update
sudo apt-get upgrade
This will make sure you're always up to date with the newest versions of Libreoffice.
Solution 2:
I note (at the time of writing this) that libreoffice in oneiric is version 3.4 for Oneiric.
Reading the oneiric blueprint - the libreoffice will be updated for lucid/maverick/natty when oneiric has been successfully tested/built. This will either be through the PPA or through the standard backports repository.
EDIT (10/10/11): the PPA has now been updated with v3.4.3 - backports has yet to be upgraded
Whilst we wait - see this AU Question as a guide on how to update to the latest version of Libreoffice.