Apparently there's a PR adding the new API that the Artemis dev is already running on a test server, but it's not official to the codebase that major Kbins are running yet.
So seems like we're very close and that should really change things in terms of Kbin apps. Also Artemis is about to launch their public beta as well and from what I understand it's looking pretty nice. Will be great to have an app that supports both Lemmy and Kbin.