So I got it. Played a bit with the AR stuff. Not impressed to be honest. Nothing seems to really pop out as I expected. 3D adds depth to the stuff that's further away but not a single thing came really "out to me", if you know what I mean. Am I doing anything wrong (I tried every distance to figure out the sweet spot), did I expect too much?
Well, not really interested in the 3D for now, as I haven't got a 3DS game, yet. Will wait for some good games...but I hope those will impress me more.