Update: The Witches of Oz will be released as both a mini-series and a feature film, dates still yet to be determined. (The premiere on SyFy UK has been postponed.)
In the meantime, here's a video which shows more clips from the film and excerpts from the soundtrack. More details here.
Dorothy Gale is a simple girl in rural Kansas who writes children's books based on the land of Oz created by her grandfather. Her mundane life is turned upside down when she receives an offer from a big New York agency to represent her books. In New York, Dorothy soon realizes that her books, and her grandfather's stories, are based on reality. The magical world of Oz and all of its inhabitants are very real and they are coming to New York City! Dorothy and her friends are the only ones who can stop the evil Wicked Witch of the West and her plans for global domination.