Thanks to WSJ for this info. You can listen to track 20 on the link.
Pretty simple post, here are the names of the 26 tracks
1. Prologue
2. Air Tight
3. In a Box
4. An Impossible Crime
5. Being Patient / Beifong’s Sacrifice
6. Asami and Mako Dine
7. On the Lam
8. Hittin’ on All Sixes
9. Good Ol’ Days
10. Before
11. Fresh Air
12. Korra Confronts Tarrlok
13. Squeaky Rags
14. Amon
15. Chi Blockers
16. A Peaceful Place
17. Left My Heart in Republic City
18. Firebending Training
19. Wheels
20. Republic City Under Attack
21. Hardboiled…Afraid (Separate Ways)
22. War
23. Asami And Hiroshi / Korra Airbends
24. Greatest Change
25. The Legend of Korra End Credits
26. The Legend of Korra Main Title
Seems to be a pretty nice mix, including all of the tracks included in the Korra Nation soundtrack preview from way back. 26 tracks is a pretty nice amount for 12 episodes.
Love the way 19 is just Wheels :)
Bryan on Tumblr confirmed he did the cover art, that the soundtrack will also be available digitally as well as physically on July 16th. He also mentions that if this sells well the chances of an ATLA soundtrack is better.