The ESRB briefly has a listing for a PS3 version of Sam & Max: The Devil's Playhouse. But the listing's since been pulled, which pretty much confirms is happening.
Spotted by Joystiq, the ESRB listed a PS3 version of Sam & Max: The Devil's Playhouse - Episode 1: The Penal Zone.
Telltale told the site that, "It's fine to say multi-platform, including PC and a selected console platform. And one might speculate on Mac too for this series, given our announcements at Macworld earlier this month. Real official news is expected very soon."
The ESRB has since pulled the listing, saying, "The platforms listed on our site are those that have been identified to us by game publishers. As it turns out, this title has been removed from our website today at the request of the publisher, but will be reposted at a later date. Any question related to this title and what platforms it will be available on should go to its publisher."
Sounds like it's on to us.