After many tv guides have reported it, Nick have confirmed that when Korra returns after the week break for July 4th, 2 episodes will air for July 11th. K304 In Harms Way and K305 The Metal Clan. From 8pm EST to 9pm EST.
I do wonder if this will be how Nick air episodes every Friday , 2 episodes each week or if this is just special because it will be the return after the week off. I also wonder if part of this is because the Mexican leaks included episodes 3, 4, 5 and 6 of Book 3 and they want to get past them quickly so there are no lingering spoilers.