Actually PRISM is just a piece of crap decoy.
PoI is going Sarah Connor Chronicles way.
I understood that given by the description in the Machine's UI. PRISM seems to be a decoy, though it not known whether for the Machine or the Samaritan.
I am interested in whether the writers will take a shot at the political angle. Will there be a Snowden-like personality inside the show? If you take the show's name literally, Snowden is actually a significant Person of Interest in the real world. In the procedural plus conspiracy format of the show, will there be wiggle room for exploring serious drama?