I am venturing to guess they will continue to produce more sellable cars for dealers than they build preorders. They know we want our cars, they want more available to the masses.
Although us enthusiasts are a factor, fact remains we are a small factor in the survival of GM. They need to sell a lot more than 15,000 pre orders. It just makes sense for them to build more for the lots.
Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting "Holy shit, what a ride!"