I would like to know this as well. The screen of the 5 looks great but it looks like it could be closer to the surface like the HTC One X which is laminated.
I thought the iPhone 4 and 4S had laminated screens though. I've never gotten dust under the screen with the 4.
I'm not sure exactly what kind of adhesion is used but it is fused to the glass, yes. And trying to seperate the two almost always results in a damaged LCD.