Prior to a SD-card death my PiAware was receiving a v6 IP from my DHCP. I have confirmed that many of my other IPv6 devices are receiving a v6 IP, but the pi is not. This was a fresh install of 3.5 (upgraded to 3.5.1), /etc/modules has ipv6 in it (that is the only line in the file), and the Pi has a v6 local ip:
eth0 Link encap:Ethernet HWaddr
inet addr:192.168.1.211 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: /64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:13783 errors:0 dropped:0 overruns:0 frame:0
TX packets:5651 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:895724 (874.7 KiB) TX bytes:2606096 (2.4 MiB)
Multiple reboots and it’s still not receiving a v6 IP.