The Little Mermaid: Ariel's Beginning (DVD 2008)
From the Disney site:


Every story has a beginning but only one begins under the sea
...Now, for the first time ever, discover the story you never knew in ''The Little Mermaid: Ariel's Beginning,'' an all-new motion picture only on Disney DVD. Returning favorites Sebastian and Flounder join Ariel, her six sisters,
and the deliciously wicked new villain Marina Del Rey in this all-new movie filled with spectacular animation in the tradition of the original, and overflowing with new songs from award-winning composer Jeanine Tesori. Long ago, in a kingdom where music is outlawed, King Triton's youngest daughter, Ariel, discovers her love for music in a secret, underground music club. Torn with the choice of whether to hide her passion or share it with her father and risk losing everything, Ariel sets off on a daring adventure to restore music to Atlantica. Rated: Anticipated G (TBD). Available to own August 26, 2008
You can pre-order The Little Mermaid: Ariel's Beginning from Amazon and it will be delivered to you the day it becomes available to the public. How convenient is that?