This weekend, I set out to finally add functionality to allow subscriptions for Privileged Group entries. I believe the system is in place, but it ain't all prettyified yet. When you subscribe to a journal, if you are logged into a group on that journal, then you see a checkbox to allow you to sub to that group also (if not you see a group login box). From there out, it should work the same as any old subscription, except that when the journaler posts a Privileged Group entry, you will receive a notice.

If you use privileged groups on your journal (or if you're just bored), try out the process and see if it works for you.