I’m don’t claim to be an IPv6 expert (I will leave that to folks on the IPv6 Buzz Podcast who really are experts) but this whitepaper from Internet Society is an excellent reference on IPv6 Security.
This document provides an overview of IPv6 security that is specifically aimed at IPv4 engineers and operators. Rather than describing IPv6 in an isolated manner, it aims to re-use as much of the existing IPv4 knowledge and experience as possible, by highlighting the security issues that affect both protocols in the same manner, those that are new or different for the IPv6 protocol suite, and those that arise from the co-existence of IPv6 and IPv4.
I would suggest reading this to keep your IPv6 knowledge fresh and up to date. Then file it away carefully for reference in the remote possibility that you will called on to design IPv6 on your network.
IPv6 Security for IPv4 Engineers | Internet Society : https://www.internetsociety.org/resources/deploy360/ipv6/security/ipv4-engineers