I made leap! I pre-ordered through Amazon and have an expected delivery date between 9/21 and 9/25. As of 0215 EDT, the Adorama site is still not set up, though B&H and Amazon have both been taking pre-orders since about 0130 EDT.
I bought a used D-70 for my teenage daughter to learn with, and a D-7000 for the office, but I have been holding out for a FF model for personal use. This should fit like a glove. I was very happy to see the D600 will be weather sealed to the same degree as the D800, that was a happy bonus feature that hadn't been mentioned prior to release.
Now, somehow I have to sneak my lenses out of my kit without my F-100 noticing what is happening.