KenB Trailblazer is a programme in which we offer some publishers the option to test some of our features that aren't yet released. As these are unreleased features, we don't yet have a lot of documentation and you won't find much on Google - but it's all in the works.
"Join" won't actually commit you to anything, it will just make the feature available in your dashboard. I've went ahead and clicked "Join" for you, to make these available in the NicheIQ section of the dashboard, since that didn't seem to be working for you.
"Wordsmith" is a feature released this week, which will assist you in turning an outline of an article into a full article. It's an AI writer, but it gives you a lot of control to make sure that it's accurate and in your voice.
"Additive AI" allows you to live edit text on your site and to make paragraphs longer / reword paragraphs / insert new paragraphs with the power of generative AI.
Hope this helps! 🙂