As promised, HBO GO will be available soon on PS3. In fact, it'll be available on the PlayStation Store later today. In order to access HBO GO, you'll need a subscription through your cable or satellite provider. Then, using your log-in, you'll be able to stream every episode of every season of many of HBO's most popular programs.
The app is also coming to PS4, although no word on exactly when it'll drop. "We are also working diligently with HBO to bring the HBO GO app to PS4," SCEA VP Phil Rosenberg said on the PlayStation.Blog.