workarounds:

sudo sysctl net.ipv6.conf.wlan0.accept_dad=0
followed by disconnecting and reconnecting wireless gets IPv6 back for me for 
the session, and
adding 'net.ipv6.conf.wlan0.accept_dad=0' to '/etc/sysctl.conf' got IPv6 to 
work on reboots.

without that command:

IPv6 works on my Orange PI (wired/wireless, with the same router).
IPv6 worked on my ethernet port(well it did before it broke - don't force 
in/out uncrimped cable ends)

IPv6 seamed to work on this system with another router when doing
wireless. (brief impromptu test, forgot if I already issued the sysctl
command)

(Debian 8)

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https://bugs.launchpad.net/bugs/1120617

Title:
  No IPv6 and "IPv6 duplicate address" with IPv6 privacy extensions on

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