Private gossip efforts kinda stalled without a champion, sadly. Gossip v1.5 is mostly redoing gossip so that we can do taproot channel announcements and also minisketch the gossip sync protocol. It also theoretically supports announcing more aggregate channel capacity than UTXO proofs provided but unclear whether people will implement that (especially on the announcing side).

Ideally someone with a bit of time could sit down and spec out (and then implement) log-scale ringsig announcements, but I’m not sure it’s gonna happen soon on its own.