Seriously, just release the show already.
Spoilers, huge ones obviously. Also, there are two GIF files here, in case it slows your computer down.
EDIT: Also a link to some clips from legitimate review site! :D
And for an added bonus, here are two GIFs from the first episode from the 4ChanPlus Avatar section,
And here is a link of the Korra vs. Gangsters fight, though watch it ASAP because I don't know how long it'll be active,
EDIT: New clips of Korra vs. the gangsters, training etc. :)
Over on io9
Observations, looks like Katara'll be appearing more than just in that brief bit at the beginning when she gives Korra her blessing to go and start her airbending lessons. And it seems we can add radios to the technology that they have in the show in addition to the airships, cars and motorbikes that have already been shown.