The Australian DVD website "DVD Land" has tossed up a listing for Equestria Girls. There isn't yet a release date mentioned, but they did include a slightly updated synopsis to go with it. Head on down below the break to check it for all those spoiler avoiding people!
Thanks to Night-Feather for the heads up!
When her crown is stolen from the Crystal Empire, Twilight Sparkle pursues the thief, Sunset Shimmer, into an alternate world where she finds herself turned into…a teenage girl! To regain her crown and return to Equestria, Twilight must learn how to fit into this strange new world and defeat Sunset Shimmer in a competition to become crowned Princess of the Fall Formal at Canterlot High. Luckily, she’ll have the assistance of Spike and five teenage girls who remind her of a certain group of ponies back home.