I've manually upgraded 8 machines so far, none received the update via WU, always reported "Up to date".
Nothing here either, and I have neither the time nor the internet connection to deal with it at the moment, so I'm fine as is.
When do I start getting worried that I haven't received the AU on any of my computers? Got the Patch Tuesday updates so WU is working.
Could be something has changed with the AU, I've been successful on two laptops opening the iso, and double clicking on setup. My desktop fails at first reboot doing that, one of the things I hadn't tried yet was getting it through WU.
The quote below is how I did the first one through WU, just tried it today and clicking on "Learn more" does nothing. That's interesting, wonder what has changed, it was taking you to an MS page with a button to "Get the Anniversary Update Now" That's the link in the quote, I just tried it and it still works.
I tried updating 2, 1 in VmWare and 1 in a dual boot with 7, all I got was errors so I did a clean install on both.