The sources for the OpenAM site are are visible under http://sources.forgerock.org/changelog/openam/trunk/opensso/openam-site/. If you have commit rights to the subversion repository, you can participate in updating and improving the site. I do not think there is a cron job yet to rebuild the site automatically when the sources are updated, but that should come. In the meantime no doubt somebody on the Dev list can push out an update.
All of the previous OpenAM web locations remain in place. If you were going to the wiki through openam.forgerock.org, however, update your bookmark to point to https://wikis.forgerock.org/confluence/display/openam/Home.