I'm in pretty much the same boat. Ordred my D600 1 day early from B&H. I had hoped that I would be able to get a credit from B&H as I really don't need/want the kit lens, but the best I can do is return this D600 and re-order the kit.
At the end of the day, I don't think I will bother as I paid a price I was happy with for the camera I wanted. Not sure I want to go through the hassle to get a kit lens that I have no use for. My first thought was that I could sell the kit lens, but my gut tells me that there are going to be a lot of those hitting the used market very soon.