User blog comment:PlantyThePottedPlant/Random Topic Blogging III: Blog Harder/@comment-1659929-20140216080715/@comment-1518158-20140216203831

The Animation Guild reported that a Disney staffer said that most of the show's board artists have left and that the series and specials have wrapped up, but then Swampy refuted this saying that they're just taking a hiatus and making plans for what to do next, and then Aliki confirmed that they're going on an indefinite hiatus.

So yeah, the show's not cancelled, but production of season 4's winding down and the crew's pretty much waiting to see if Disney will renew it for season 5 or not.