This is how the PSN Pass looks like
TheSixthAxis have posted a picture of their PSN Pass which they got from their Resistance 3 press kit. You need PSN Pass to play Resistance 3 online, as it was introduced recently by Sony. Resistance 3 will be the first game from Sony that utilizes this Pass. You can check out the images over here.
The game releases on September 6th for the PS3 exclusively.