The 1.2 MB could be referring to the exclusive theme being offered by the Sony Entertainment Store for the PlayStation 3 version. You can get the preorder bonus from your download list after pre-purchasing the videogame.
The Legend of Korra is not your typical quick cash-in vlicensed ideogame because it was developed by Platinum Games. The studio is widely revered for creating the best action experiences with previous efforts like Bayonetta, Metal Gear Rising: Revengeance and Vanquish. They recently got done with Bayonetta 2, which is one of the highest-rated games of 2014. Preorder the Wii U exclusive sequel with this link. Platinum Games also partnered with Microsoft for the Xbox One exclusive, Scalebound.
The Legend of Korra is a sequel to Avatar: The Last Airbender that began airing in April 2012. The fourth season recently started for the animated television series. Purchase the previous three seasons right now on Amazon.