All the pictures on Teslamotors.com X subsite (as of a few minutes ago) are 22".
Going through the reveal event video in order of appearence; white 22", black towing airstream 20", sig red 22", founder #6 sig reg 22", #5 titanium 20", #4 white 22", #3 blue 22", #2 white 22", and Elon's #1 21" dark gray.