Hi,
The roadmaps/Tor/IPv6 [1] wiki page has been started with the goal of communicating the status of the work with Tor on IPv6.
Additionally, searching for Trac tickets with the keyword "ipv6" [2] might give a picture of what's going on.
Asking here or highlighting ln5 on #tor-dev is of course another perfectly fine option.
[1] https://trac.torproject.org/projects/tor/wiki/org/roadmaps/Tor/IPv6 [2] https://trac.torproject.org/projects/tor/query?keywords=~ipv6