I'm almost wondering if the product line is in doubt, or if Apple is actually getting out of that business.
http://appleinsider.com/articles/16/12/21/apple-airport-firm...
I'm almost thinking that they might shift things towards the Apple TV as a "Apple Home" kind of thing. Hard to tell.
If i was going to replace the Airport Extreme that I have, I would be going with a Ubitiqi edge router of some sort and one of their access points. The stuff seems well supported and has a decent community behind it, in addition to being reliable and making the pretty graphs that I want. :-)