Dave Gilbert has finally announced his (reluctantly non-AGS) Playfirst project: Emerald City confidential, with heroine Petra, Dee Gale (think about it), The Lion and many others from the land of Oz. You can discuss it on the forums, too..
As a beta-tester, I've played it and its pretty amazing. And HUUUGE. And not at all like any movies of Oz you may have seen.