Looks like a lot of work was done on the GEDCOM importing and exporting, helpful for those moving from other genealogy software applications or taking their genealogy information with them. There are also several other improvements, both UI and performance.
MacFamilyTree 6.2.3 Changes
* Several fixes and improvements in the GEDCOM Exporter and Importer
* Sources List now shows source abbreviations
* Web Media improved
* Date parsing improved
* Descendant Chart improved
* Performance of the Tree Chart improved
* Several other bug fixes
It is still on sale through January 17th, 2012 at Apple’s Mac App Store
Update: MacFamilyTree 8 – Synium Software GmbH is currently only available as a new purchase.