Some home video and a book coming later this year.
Source: “The Legend of Korra” Gets May 21, 2013 Release Date for Book 1 on Home Video; Art Book on July 24 Toonzone (http://s.tt/1zw39)
Keen-eyed Amazon.com shoppers today spotted a release date confirmation for their first volume of Avatar: The Last Airbender spin-off, The Legend of Korra animation: Book 1: Air. Details are a little short, but the release date for this set on both DVD & Blu-Ray is May 21, 2013. According to the Amazon listings, the DVD has a list price of $19.99 and the Blu-ray will cost $26.98.
Also, following up on the Avatar: The Last Airbender - The Art of the Animated Series book, Dark Horse will release a similar book for Korra fans: The Legend of Korra: The Art of the Animated Series Book One: Air. This hardcover will weigh in at 184 pages in full color and retail for $34.99. It will also contain never before seen artwork. The book will be avaialble July 24, 2013.