Thee are two rumours floating around right now. The first rumour says that you can order online at Apple.com on the 29 and orders will ship on the 2nd and the second rumor says that there will be NO online ordering at all for a while. At least not until Apple is sure it can meet retail demand.
You can choose which ever you would like but I choose the second one. Better get out and wait in line like the rest of us poor slobs.