Just an fyi for anyone who's rooted and had to go through the unroot process after being notified of the update.
I saw the update notification, then unrooted and reloaded the stock recovery like it says to on CM's website
. But when I rebooted, the notification was gone and when I went in to manually check that I had the latest LF9 update, it wasn't there and it kept saying I was up to date. I knew this wasn't the case because LF9 was not what I had in the 'about device'.
In any case, once I rebooted into the stock recovery, there was an option to update from internal cache and lo and behold, there was the update sitting in there. I chose it, it updated fine and now I'm going back and rooting the phone.
Hope that helps someone!