I agree with Ferretz. The heart of the Order is important and need not be 'vanilla' as Guardians of the Forest expresses by introducing the importance of senority and the Guilds. There has been some suggestion in the books that Normandy engages in illusions and covert work because of the large number of mundanes in the region. Exploiting that idea, one could easily make the Hermetic Normandy world very different than the Rhine and not 'vanilla'.
I have always wanted weird books myself. A history book, or an alternate setting book, even if they occured on "Mythic Earth". Mythia Asia or Mythic Araby in particular, but I'm not sure if these are marketable products.
I love the Tytalus and yes I want Fudarus to get it's day in the sun. But I would be happy with anything that is up to Guardians of the Forests quality. If that kind of feel and quality can be maintained, I'll be happy with the book regardless of what the setting is.
On old books, observations suggests that when the old tribunal books go out of print they'll become available as PDF's. But do old Tribunal books merit a reprint or rewrite?
I don't think any one Tribunal book is strong enough to merit an update or reboot. As an example, over the years the Rome book has slowly grown on me, but what do you do with that book? Update it? There's not much to do in terms of updateing it. Rewrite it all together? Having rewritten it, what is the return on the investment? Certainly the diehards (that includes me) would get it, but I can see the existance of two Tribunals book "Old Rome" and "Rome 2.0" hurting each other. Even if one is out of print, a person who owns "Old Rome" may not feel a need to buy Rome 2.0. Beyond that, my guess is Tribunal books are good sellers, but they aren't as good as Realms books, or anything that involves magic and wizard stats.
Again, Rome was just an example. My point is, while I have no part in decideing anything about the Ars line, what makes sense to me is the production of new Tribunal books over rewriting/rebooting an old one.
On a side note, I just picked up Sanctuary of Ice. Yes it's been out forever. It wasn't a region I was interested in and in terms of saving cash it was something I didn't need to get. I've always passed it up for something else. Recently I've had a little cash to burn so I picked it up. I like it a lot.
What I disliked about the very old Tribunal books was they were heavy on mundane information and low on insights into the Hermetic World. I always felt like the Hermetic information provided was thrown in at the end and that always frustrated me. Sanctuary of Ice does a great job of detailing the world of wizards. Had all the old Tribunals books shed insight into the world of wizards like Sanctuary of Ice did, the world of Ars would be so much richer than it already it is.
That sort of insight was maintained in GoF. If the Tribunal book, where ever it is set, can maintain a focus on the world of wizards over a historic listing of mundane facts I'll continue to be a happy consumer.