Sony has PS4 demo kiosks rolled out and ready to play across the US. Like, now. Sadly for the moment they're only in Sony stores, making them a little harder to track down, they'll soon be in more accessible spots like GameStop, Best Buy, Target, and Walmart.
If you want to see if there's one near you, Sony's got a tracking tool which you can use by punching in your zip code.
Interesting choice of games up there on that menu. Would have expected a little more Killzone.
Experience PlayStation [Sony]