I just got back. The setup is over in televisions, NOT gaming. They have it hooked up to a 60 Inch Sony. You can play 2 different levels, each has one of the 2 different characters. The loading is very slow, but the game is pretty fun. I thought it looked great. There were a few framerate hiccups, but only when things were deteriorating or falling in the level (its part of the level). If it means anything, I went over and preordered LBP3 for PS4 after playing the demo, even though I was gonna Day 1 that bad boy anyways. . You get a free Sackboy Plus at Best Buy if you preorder.
They give you a free Little Big Planet 3 poster. I grabbed a couple. One for my classroom and one for my daughter.
The real shit was they had an Axiom Verge Demo on PS4. It was awesome. They have also added a Driveclub Demo, the new Fifa, and NBA2k15 demos as well.
I think that depends on the store. Mine had it on a small tv on a endcap in the gaming area. I asked the lady at the welcome table by the front door where the demo was and directed me to it and told me they were having issues.