Short answer: no - once a release is out, new features are not added to it.
There is a bug reported about this for LibreOffice 3.4 (#fd35422). Please subscribe to the bug (unless you’re the reporter). You can also bring attention to it via forums, social networks,etc., however reverse-engineering or even implementing features from other formats (even from documented sources) may take some time as other priority tasks may take the existing resources already.
Also see: