A dealer detail will definitely result in swirl marks. Perhaps not very noticable to you initially, but overtime, it will appear your car is covered in spider webs.
Either hire a professional to do an initial prep for around $200-$300 or learn to do it yourself.
My 2009 white 550i has swirl marks, but due to the light color, they're not noticeable.
I'm expecting delivery of a 2011 carbon black 550i. There are notes on my order not to prep/wash the car when received and I've threatened the salesman with bodily harm if its "clean" when I get there.
Search here for new car prep or try www.autopia.org
A friend of mine has a blue Bentley and it looks horrible. He can't even stand it now.
Enjoy your new car!