The first season is still airing and this episode is from two weeks ago. Hopefully they'll start releasing DVDs at some point, though CN admittedly doesn't have a great track record in that department. Flapjack is still lacking a decent DVD set even though the show is over and they aren't bothering to re-run it.
Thurop Van Orman mentioned the marketing/DVD department at Cartoon Network is immensely shitty. Which makes sense, given that it took them 15 years to release a Powerpuff Girls collection on DVD.
At least Thurop is working on Adventure Time now, and that's already been renewed for a third season.