No, that's not the case at all, nobody has had that happen. Not one person here has gotten shipping notifications for the exact same model watch/band color as someone who ordered minutes after midnight who didn't.
If you are saying people with different size/color combinations are getting theirs faster in some cases, then yes of course, the Space Black for example wasn't ever set to ship until May, so if you order a 38mm green sport it'll probably ship sooner.