The newsletter is sent out in multiple waves, it's possible that they're not through sending it yet. If you've been on the list for a while and have a previous issue, then you probably have nothing to worry about - it'll get to you in time. If you've joined recently and wouldn't have a previous issue because you're new, then you should see a 'welcome' message (which includes how to get on and off the list) when you first signed up. If you don't have either of those, you may want to go back to the JRS page on the main site and enter your info to subscribe again.
Check your PM's/email though, I've sent you a copy directly