Nickelodeon announced the news today via IGN. The first two episodes will air on Friday, June 27th, from 7-8pm followed by a special bonus presentation of the third episode of Book Three, “The Earth Queen”, at 8pm.
There will then be a break for the Fourth of July holiday, and new episodes resume in the show’s regular timeslot, Fridays at 8pm, beginning July 11th.
We’ve got the official descriptions for the first two episodes:
“A Breath of Fresh Air”: After the events of Harmonic Convergence, Avatar Korra discovers that her decision to leave the spirit portals open has unexpected consequences. Wild spirit vines have overgrown Republic City and Airbenders are suddenly popping up across the four nations.
“Rebirth of a Nation”: Korra, Tenzin and Team Avatar search for new Airbenders in an effort to recruit them and rebuild the Air Nation. Meanwhile, a band of sinister criminals are organizing to hunt down the Avatar themselves.
Watch a clip from the season premiere below: