Three games are playable
Attendees of San Diego Comic-Con can be among the first to get hands-on time with PlayStation 4 by playing Octodad, Knack, or DriveClub at the event. Other games on display at Comic-Con include Spelunky and Tearaway for PlayStation Vita, plus Puppeteer, Beyond: Two Souls, and Gran Turismo 6 for PlayStation 3.
If nothing else, you're going to want to feel that beautiful new DualShock 4. I've never cared much for the PS3's gamepad, but I'm telling you, the new controller is a huge step in the right direction. Good bragging rights over your non-SDCC-attending friends!
PlayStation at Comic-Con: First Public PS4 Hands-On [PlayStation Blog]