Olly, I'm really interested in this topic also.
Our team has looked at importing ODBC data from Filemaker Databases to attach data to Symbols - which seems to work, but we have not worked out how to import and attach IFC data to over 1000 symbols, and frankly non of us fancy manually inputting the data. As everything works from databases at either end of the process it follows that getting to the data should be a lot easier, whether it is for import or export.
With Government edict that interchangeable BIM is a business requirement for publicly funded projects we definitely need more VWks help on this now mission-critical need, or VWks will lose its customer base.