We are trying to track the change to the Grid Coverage specification - they changed coordinate reference systems on us.

In summary, the old specification can be browsed here:

http://geoapi.sourceforge.net/legacy/javadoc/index.html

(replace 'opengis' by 'geotools' and you get the current geotools implementation).

The new specification (where we are going) can be browsed here:

http://geoapi.sourceforge.net/snapshot/javadoc/index.html

We are in the process of performing a refactoring of the code from the old specification (org.geotools.gc) to the new one (org.geotools.GridCoverage).