I can say for a fact after playing with it at Google I/O, the interface is not in 3D. This has come up multiple times and it just is. The 3D effect is pretty much what yourfriendmat points out. Go to Best Buy and play with a Nintendo 3DS if you want to see the effect. Then turn your head to the side so the 3DS screen is vertical and watch what happens to the 3D effect. It goes away, like magic.