Because of the whole
'someone went and released several episodes of the season early' thing, it was decided that the trailer for Book 3 would be released before its planed release during SDCC. Take a look!
https://www.youtube.com/watch?v=A0UBbzeFc74While some may consider the trailer spoiler-ish, based on what I've read on the leaked episodes, most of it is stuff that you'd find out within the first few episodes, if not the first two. However, there is stuff that the creators haven't revealed yet (outside of the trailer that is), so if you want to keep yourself in the dark, you'll want to skip the trailer.
http://www.escapistmagazine.com/news/view/135346-Legend-of-Korra-Book-Three-Trailer-Released-Early 
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