No, it’s not a long lost episode, just a Perturbed Dragon tie-in, a song-writing contest hosted over at ENWorld. Specific details can be found here, but the gist of the contest is write a song, sing it, record it, and send it along to Russ and Darren Morrissey over at ENWorld. The song will be posted at the site and voted on by the RPG* community that frequents the site. The winner gets to write a song (and possibly sing it) for an episode in next season’s The Perturbed Dragon.
Hmmm, maybe that means the likelihood of there being a next season is looking better. Let’s hope so.
If you decide to enter, good luck.
*Role-playing game, not rocket-propelled grenade, though some games I’ve run across probably would best serve as the latter.