This "You Should Know" post is top of ~June, for good reason. This post announced the kbin.social Federation/compatibility with Lemmy.

A huge amount of test-posts from a wide-variety of instances came in to test the new federation abilities (including from kbin.social, one of the biggest kbin communities).

I think this post shows the hope that over the long-term, we can get federation across the larger fediverse. I don't know if Mastodon is in the works, but these kinds of posts give hope.