Rumours are that there will be the movie "Wicked" in 2010 (listed already in IMDB - but who knows how reliable that really is), and I really wish these rumours are true, because if "The Wizard of Oz" was great, the prequel was just "Wicked".
I had the chance to see the musical in Toronto a couple of years ago, and it totally changed the way I see the "The Wizard of Oz". "Wicked" tells the story of Elphaba (the Wicked Witch of the West), and her friendship with Glinda (the good Witch of the North). Really cool to learn everything that happened in Oz before Dorothy's arrival from you know where.
There are so many fake videos about the "upcoming" movie everywhere, I just hope they really make one.