http://ciisqbg45nggykdl6rjdrq3wc64csga4vkphu66qsi65mypeitqedoad.onion/blog/ipv6
Plus, with such a large address space available, we can frequently rotate out the exit IP, which should keep us out of those lists. We might eventually do separate entry/exit addresses for IPv4 too, but that will take time since all of our current IPv4 addresses are known since we've already disclosed them, and it will take time to order new IPv4 addresses for all the servers.