Objective: Provide a stable release which works with both BibTeX and Biber. The 1.x releases gradually move the development focus to Biblatex 2. The BibTeX backend is still supported but major new features are "Biber only".
Objective: Drop BibTeX support altogether. Before new features are implemented, all BibTeX-specific hacks are removed from the code. After that, new features are added provided that they do not affect the data model in a fundamental way. Fundamental changes to the data model are deferred to Biblatex 3.
The 2.x releases introduce new features but maintain backwards compatibility in terms of the data model. Ideas include:
The objective of Biblatex 3 is a revised, richer data model.
To be continued...
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