We heard rumblings about it last month, and it has now entered certification. It is hoped that the patch will be with us in the next week or two.
"The update for Worms XBLA is now in the hands of the test group and due to go into a final certification check soon. We'd hope that this means it's available in the next couple of weeks. It's taken some time because with the title being heavy multi-player there's a lot to check etc. Sorry for the delay"