There's no mailing list... right now just the fediverse and twitter accounts, irc, and the gitlab branches. I would be open to having a mailing list except that I'm aware the kind of maintenance burden involved in keeping them alive, and I have too much work to do on the core. Recommendations?
(Also, I hope we can get to the point where we dogfood Spritely for Spritely communications, but I think that's ~1-1.5 years out from now.)