The Tomb of Sammun-Mak, the second episode of the third season of Sam & Max, The Devil's Playhouse, is out now for the PC and Mac! Those who ordered the season can pick it up now. If you haven't yet ordered it, you can buy it at the Telltale Store or through Steam.
If you buy it through the store, consider placing the Puzzle Agent Pilot in your cart. You will get 50% off everything else that's in the cart with the pilot. The Devil's Playhouse works as part of that deal.