Here's a good video -- this one shows the Paperwhite both in normal room light (and looks more like what I saw, except for an overhead light that's blotting some of his out) and in a pitch black room.
What's good is he shows why you'll see the difference in full darkness, and I'll start you at that point, though you can just back up to the Start at any time.
http://www.youtube.com/watch?v=u-SEYSHSVKc#t=1m27s
He also gives a good demo of the features.