TheDude recently upgraded the server to the most recent version of Lemmy. You'll notice significant improvements to the user interface, and hopefully the functionality is also improved. There is no official changelog yet because this version is not yet finalized, but I'll link the GitHub releases page where it should eventually appear.
https://github.com/LemmyNet/lemmy/releases
Edit: 0.18.1 is now fully released and we have upgraded to the final version. You can view the link above for the changelog.
Kbin federation appears to be working indeed if someone had subscribed to a community before the 0.18.0 update. Waiting to see if a community that no one had subscribed to on this instance syncs in.
Edit: it hasn't been pulled in overnight. Maybe it'll only pull their content in after a new post is made?
Edit 2: It pulled in, but I didn't see that it had because the current default is to hide all posts that you have already read. So confusing!