According to these sources:
Tweet by Bridget, 4/26: Got some news that Seeker is no more. So sad to say goodbye to my NZ family but excited for what’s next.
Tweet by Syfy channel, 4/26: Legend of the Seeker fans, we considered LOTS seriously, but for a variety of reasons, we unfortunately had to pass on the show.
Interestingly, PopStar.com has taken up the “How You Can Help Save Legend of the Seeker for a Third Season” bandwagon. I’m guessing it’s too late, though.