I'm preordering tomorrow as well... and something about the white just screams iPhone and doesn't appeal to me. The pebble blue looks nice however in some photos/videos and depending on the angle, I see what looks like a purple tint but that could be the lighting...
Samsung Galaxy S3: Design der Farbe pebble blue | SwagTab - YouTube
I called my local VZW today to see if they had any mock units for display just so I can get a jist of the size/color and the rep they don't but said it's similar to the Galaxy Nexus... Now only if the S3 came in.. you know.. black... but no... that's to 'generic' and not a 'Nature' color.