We now have a preview clip for one of this friday's episodes, that being the first one K211 Night Of A Thousand Stars. We obviously will not be getting a clip for K212 for spoiler reasons.
[caption id="attachment_8295" align="aligncenter" width="600"] Bolin visits Mako in jail.[/caption]
www.nick.com/videos/clip/legend-of-korra-123-clip.html
Nick.com is region locked and so is only available in USA, use a program like Tunnelbear to get around the block.