I see references to PPA's, etc. for latest LibreOffice. My question is more whether Ubuntu 12.04 LTS will get the latest stable releases of LibreOffice going forward?
There will be minor and stable updates from the same series, that is 3.5.X for precise, but no update on the next major as it introduces a lot of new features. One man's feature are another man's regression (simply because behaviour changed).
So if you want a new major you need to try the PPA: