The reason why Telltale Games haven’t brought a title to PlayStation Network is simple: the studio hasn’t ported the engine yet. Speaking with The Guardian about the Tales of Monkey Island series not hitting XBLA or PSN, Telltale designer Dave Grossman explained that the studio prefers to develop for one console platform for the “initial run” of episodic content.

The rest is here:
Telltale: ‘our engine doesn’t run on the PlayStation yet’

