Just in case you were curious about what this one would look like, we now have a cover for Rainbow Rocks. There was a placeholder for a while (which they are still using for the Blu-Ray version), but this is the final product.
Release is expected for October 28th, or a month after it's theater debut. Full description below the break to avoid them spoilery thingies.
Thanks to Brony250 for the heads up.
Canterlot High is hosting a musical showcase and Rainbow Dash, Applejack, Pinkie Pie, Rarity, and Fluttershy are going to be performing with their new band, The Rainbooms. But when a new girl group, The Dazzlings, arrives at CHS, they convince everyone to turn the friendly showcase into a Battle of the Bands. As tensions mount between the competing musical acts, a reformed Sunset Shimmer realizes that the Dazzlings may not be ordinary girls and are after something far more sinister than just being named Best Band at Canterlot High. The Rainbooms call on Princess Twilight to return to their world to help them perform a musical counter-spell so that they can win a battle that now determines the fate of the entire school.
