As far as we know, the rest of the Devil's Playhouse episodes have been canceled on iPad. Telltale's supposed to be releasing the rest of Tales of Monkey Island, though personally I wouldn't get my hopes up. :/
"Always expect the best of others... And watch as your hope is crushed like crackers in a fat man's bed. And the fat man is angry. And the fat man has a sledgehammer. And the fat man is yelling 'DIE, CRACKERS, DIE!!'"
- Rat, Pearls Before Swine