There will be no starting price. The market will set the price by placing buy and sell orders.
I would expect when the market opens the best buy offer you will see is ~$5 and the best sell you will see is ~$20. The spread will gradually lower until orders begin to be matched. That will be the new market price.
This.
And nothing other, this actually says how (any) market works. Mt. Gox can't give any price (in an auction model), they just can set the initial ticker value (but this says nothing).