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I don't think that they ever will, unfortunately. I absolutely love the series so I wish that they could get the remaining seasons. However it all comes down to licensing and whether or not Netflix can gain access to it. Sometimes netflix even has to miss out on individual, random episodes as it may contain a song that Netflix does not have the rights to. So in short, I doubt they will get more- even though I really wish they would! 2 seasons isn't enough :)