@UltimateKorra on Twitter for Korra updates
After a decent amount of waiting time, we have a Legend of Korra Book 1 DVD release date. July 9, 2013 is the confirmed release for the DVD and Blu-Ray versions of Season 1. Along with that, we have the DVD Trailer as well as a confirmed message about exclusive commentary from Bryan Konietzko (co-creator of Avatar and Korra) on one of his Tumblr posts.
For the extremely excited fans, Amazon and Best-Buy have pre-ordering options available online.

Update - Book 1 for DVD & Blu-Ray is now officially available for purchase.

Tip - Watch Korra Online Free Here