Hi Tobias,
I can suggest the following pages that might provide some way to stay on top:
Blog about SAP HotNews for critical updates
Wiki pages about Afaria announcement
If you for example sign up to "watch" this wiki page, you might already come close.
Another alternative would be to monitor SCN and eventually follow certain people that typically post updates about Afaria 
We are still working to improve in this area.
Hope this helps.
Best regards,
Bernd