I’m afraid there aren’t any plans to add Threads as a temporary logo, and we’re currently still waiting on the upgrade to FontAwesome 6 for this to be available.
In theory, yes. But it looks complicated - just for having a link to our Threads account or having the Threads accounts of our users (nobody entered one in his/her user profile, yet) in the Clickable Social Icon Links on Profile theme component.
But thank you for bringing this up. I was not aware of this. And for sure it is something for “real own” icons which will never be part of FontAwesome.
For my use case and the Threads icon I will wait for FontAwesome 6 integration.
You can already see it live here in my forum (header menu and footer menu). And I also created a PR for Social Links Clickable theme component just now: