I'm really not sure if fans have had the chance to play the PS4 at E3 or any other convention, but I don't remember it being played. Anyways, good news since both the PS4 and the Xbox One will be playable at the GameStop Expo. They are offering a variety of games and maybe even exclusives to be played on the consoles. I guess it's a great way to determine which console runs smoother and faster.
Via Polygon
GameStop Expo 2013 attendees will have the opportunity to go hands-on with the PlayStation 4, Xbox One and a wide variety of games, according to a recent press release.
Via Polygon