A few ideas how to develop the project further, currently a list as a reminder for the main developers themselves, in no particular order, though with a tendency to list more important aspects first:
For later versions
Remaining standard BibTeX record types
Adding all optional properties for record types?
If so, differentiate between required and optional types?
How to handle author/editor fields, where one needs to be present (are they mutually exclusive for some record types?)
String replacement in BibTeX records (e.g., for journal names)
Explicitly support biblatex-defined record types?
Handling of “and” in lists of names? (Caution: internationalisation?)
Template engine for string output formats