The latest major release of this package is biblatex 0.7.
The latest maintenance release is biblatex 0.7g.

All components of this package always have the same major version
number but they may have different patch levels. For example, there
may by a style.cbx with version number 0.5c while biblatex.sty has
0.5a. This is normal. Note that dependencies are not obvious from
the patch level. For example, biblatex.def with version number 0.5b
may require biblatex.sty 0.5a. Make sure you always have the latest
version of all components. When in doubt, download and reinstall the
entire package.