I wrote a simple Nagios check that can be used to watch for WooFramework updates, and published it here:

https://github.com/kway/check_woo

At this point in time it returns 'UNKNOWN' because the WooThemes changelog file isn't fetchable, but it should return CRIT/WARN/OK once they have their shop back in order.

Sharing it here in case it might help somebody notice critical fixes more expediently in the future.