Man, Cartoon Network leaks like a sieve! Looks like AV Club and Entertainment Weekly got some information on the upcoming batch of episodes. Check out the article and then wish you hadn't, 'cause they've got some doozies in there! Upcoming new characters, upcoming musical episode, they've got it all.
So uh, be warned if you're adverse to spoilers and plan on being on the internet before the end of the summer.
Now if you'll excuse me, I'll be off building one of these things so I can still watch the show fresh.