This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
Probably the best source of current information is the web site: http://www.gnu.org/software/gnucap. Here, you will find information on the latest developments, including other work related to gnucap, but not strictly part of it.
There are three mailing lists of interest to GnuCap users.
The web site contains the archives of these lists, and allows you to sign up for them.