"Korra is shocked to discover the secrets Tenzin has been keeping and begins to suspect one of her allies is working for the Equalists. Tahno is interrogated about the events at the pro-bending tournament."
First of all, YAY at Tahno being in more scenes than just the one in the preview. Maybe they aren't done with him after all.
Will Tenzin's secrets have to do with Yukon? Maybe what's happening in her visions? Aang and Toph?
And lastly, I think she'll at least start to suspect Asami. She may be a red herring. The real bad guy is probably her father, but Korra initially blames Asami.
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"Yet here we are, shaking our booties..."