Well, the cat is finally out of the bag. Holocubierta, the Spanish publisher of Ars Magica 5E, announced today that a new Tribunal of Iberia book will be published in the near future.
No specific release date or other details are known as yet, but the book has been written by the official translator of the line (with some minor help from yours truly) and, of course, is 100% sanctioned by Atlas.
If you have some spare time and you're fluent with Spanish, here's the video where they made the official announcement:
This was a long-needed update. Really excited to seeing this come to life!