The AI teams are working on a few new projects, though it’s too early to share information on them quite yet. I can confirm that the AI Planner is not part of these new initiatives, though some of the tech and many of the learnings we gained during development are heavily influencing the new tools.
Regarding timing of future announcements on these fronts, I wouldn’t expect any public news for six months to a year. Until then, you can track roadmap changes and request new features/tools through the public Unity roadmap portal: https://unity.com/roadmap/unity-platform