The Big Bang theory, based on Friedmann models, is used to describe how the world began. (Although it is widely believed at Joystiq HQ that the universe was in fact sneezed out by the Great Green Arkleseizure.) To Sony, Big Bang is also the rumored codename for an impending announcement they have on October 12, according to GamePro France (bad translation).
Will we be seeing another price drop? A new model? Has the Cell chip been used to discern a new universe-creation theory only capable with eight core processors? Looks like we'll find out soon enough.