The rules vary from state to state... here in Cali, you must have a car to go with those plates. So yes, some of us are drving around with "HOTSKY" on a chevy s-10 and getting funny looks for it.
when you get your sky, just transfer the plate from the chevy to the sky.
I remember reading that in states where you need the VIN, some were getting the VIN from the dealer as the car was being built and ordering the plate at that time.