Theoreticians have done a wonderful job of describing the state of the universe to within a fraction of a second after the Big Bang, and as mibs said, further refinements are continous. We can expect, I believe, to gain further knowledge of the state of the universe, to within smaller and smaller time frames of the great event itself. I do not believe, however, that we will ever get to describing the event itself, no matter how close we come to it, and beyond the event is an impossibility, that can only be known through faith. Or if you are secular, speculation.