No idea, it probably has not been decided yet.
There are 10,000 registered forum members, lets assume those are all the people that really care and want a RaspPi. There will be 10,000 Model B's shipping on the 20th, so hopefully we all get one.
Or it could be like the HP touchpad fire sale where ebay and paypal crashed after three minutes of the sale starting. Good luck!
In 2 minutes after close lol.