Didn't you get the memo. the free colour is now white.... :)
( it'll probably change again if Elon bangs his head, or has a design ephiphany)
They will probably save money having white as the default colour. Harder to see small defects, although the stories I have read is that the quality of the paint work is high now.
The configurator for NZ still has black as the default colour without extra cost.
Wouldn't buy the black one for NZ, too hot in the summer. Better with silver or white. But my plan is to wait for the second hand Model 3s to become available, so still at least a year or two away before I will even consider buying one.