Zeboyd Games has revealed that the third episode of Penny Arcade Adventures: On the Rain-Slick Precipice of Darkness, has a release date of July 10th. You can will be able to pick up the PC version on Steam for 5 bucks. The game will also release for Xbox Live Arcade, and you can pick that version up for 400 MS Points.
Zeboyd has said that they do have plans to release the game on Android, iOS and Mac platforms. No release date was given for those devices, but we can expect one soon. They also announced that if you pick up the PC version you will be entitled to Steamplay, which will give you another copy of the game for Mac for free.