Updated to the newest 7.6.3 Firmware on my Airport Extreme base stations, nothing noticeable. Here is the change log.
About AirPort Base Station and Time Capsule Firmware Update 7.6.3
This update is for all 802.11n AirPort Express, 802.11n AirPort Extreme and Time Capsule models. This update contains improvements and bug fixes, including:
- The ability to extend the Guest Wi-Fi network on a network that is configured with multiple AirPort Base Stations
- The ability to add a WPS-capable Wi-Fi printer
- Improved international support