(Both) IPv6 Privacy Extensions
One of the biggest benefits of IPv6 is that your computer’s address is a real, actual, global IP, rather than being a super-secret private IP that only your LAN knows about. I’m most excited for port forwarding to be a process that makes sense and the benefits to p2p gaming that will result. I am, however, saddened by the inevitable death of “hey join my minecraft server it’s 192.168.1.12”. (Note that you can still have a firewall in your home router, as is the norm with v4!) Anyway, I digress. There are Privacy Issues that arise from this.