Have you ever noticed "something different" about someone but you couldn't quite put your finger on it? Usually, it turns out that the person got a slight haircut or was wearing a new shade of eyeshadow or something. It was subtle, and your brain registered the change, but it wasn't obvious.
Well, the same kind of change has come to Google Maps. They've updated fonts, street widths, colors, etc. The changes aren't very obvious, but they're there. Take a look at this before and after, supplied by the Google LatLong blog: