So, yes, at least S.3 will wrap up at Nick.com in some fashion; the creators think S.4 will be done there, too. It's a bit annoying, as that's yet another "stream" to go to to find something we want to watch (the DVR, the stack o' DVDs, and now another online site), but that much, at least, is worth it.
Wonder if Nickelodeon will bother with TV-based advertising for it.
Creators of The Legend of Korra Explain the Show’s Not-Cancellation
The news came yesterday that Book 3 of The Legend of Korra was being pulled from Nickelodeon to air online. So of course the creators of the show had to address it at this morning’s Comic-Con panel — which they did, before moving on to celebrate the show.
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The http://www.nick.com/korra/ site says "New episodes every Friday at Noon."
Of course, because of the way they're doing it, and my missing a part of Season 2, I will proceed to continue not watching anything until it's all available to free-stream in any order. I'm patient.