Just wanted to send a heads up to those who use our Zigbee Pro featureset compliant products.
The ZB version 2x64 firmware is released and now available from the support website:
http://www.digi.com/support/productdetl.jsp?pid=3430&osvid=0&s=365&tp=2
Release notes with the firmware changes are found at that link as well.
For questions on specific commands, behavior, etc., click on the Documentation link at the page linked above to find the Product Manual, which has also been updated for the 2x64 release.