Try the following svn command:
svn log -l 200 http://anonsvn.jboss.org/repos/gatein/portal/trunk/
This will list the last 200 commits into active development branch (trunk) of the portal. Looks like an average is about 3 commits per day. And there are other components that are not part of this source ...
I'd say the project is quite active, but maybe not in ways you expect it to be active?
You can also look at the Jira page.
Yes, it is not active in a visible way. If you look at SVN or Jira, you see activity, but there is very little activity on their blog or twitter feed.
This is changing: http://www.dzone.com/links/gatein_32_is_released.html
More active than ever See the spec page that we just started and we keep adding new ideas that we wish to implement and get people to participate with actual code or with comments.
And BTW *We are hiring*