Disney have given
Maleficent a March 14, 2014 release date. Below is the press release which also confirms that this will indeed be an origin story that leads directly into the animated
Sleeping Beauty..
The Walt Disney Studios has announced a U.S. release date of March 14, 2014, for Maleficent, starring Angelina Jolie in the title role as Disney’s ultimate villain. The live-action film explores the origins of the evil fairy Maleficent and what led her to curse Princess Aurora in Disney’s animated classic Sleeping Beauty. Leading a team of visionary filmmakers known for creating and transporting audiences to new and exciting worlds, Academy Award®-winning production designer Robert Stromberg (Avatar, Disney’s Alice in Wonderland and Oz The Great and Powerful) will direct with a script by Linda Woolverton (Beauty and the Beast, The Lion King, and Alice in Wonderland). Maleficent is produced by Joe Roth (Disney’s Alice in Wonderland and Oz The Great and Powerful).
Super 8 actress Elle Fanning was said to be in talks to play Aurora in the movie, but since the release makes no mention of that we can assume that's not a done deal.