Saw this press release mentioned in a go6.net newsletter and noticed that it had a mention in it about Cisco and a new tool to perform IPv6 assessments with.
Here is the Press Release.
A quick jog over to Cisco's website and search for IPv6 network I found this link for IPv6 Solution Components. A quick scan through this page has a link to Cisco IPv6 Capability Assessment. This leads you to a white paper on that subject. I then searched on IPv6 Network Assessor and found only some CCIE related reference. So I guess this tool is only available to the Federal Government at this point.