After a year, I wouldn't mind if my MacBook Air could reliably connect to my Time Capsule (wideband N) on wake from sleep
Everything else connects fine to the TC, and the Air connects to every other network just fine. It even connects to the TC just fine--unless I use 5Ghz N, and then 1/3 of the time it fails to find the network. It's always been that way. Annoying.
Nothing in the notes on this update gives me particular hope, though.
My new iPhone 3GS was struggling to retrieve an IP address via DHCP with our Airport Extreme. For the time being, I'd set the IP config manually. But after this update, the 3GS now works fine with DHCP.