Bad news: Nickelodeon has pulled 5 out of the 6 remaining episodes of Korra from their schedule. They won’t be airing the rest of the season due to bad ratings, due in large part to their own issues with scheduling and marketing the season.
Good news: Bryan Konietzko is seeking means to distribute the series, and the remainder of the season (as well as future releases) digitally, so the series will continue.