Hi Mike,
AFAIK IPv6 address is still can not be used in aironet APs.
if you mention Vinay Sharma's document that metnioned no IPv6 support (it was in march 2011) you better contact him and ask for the roadmap. he is a cisco employee and will possibly have an idea if Cisco intending to add this feature in the near future wtih aironet APs.
Amjad
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