The Evil Hat webstore has to be manually updated by Fred. Fred is currently at the DFRPG release at Origins, so many people will get the books before the store is updated.
Fred's twitter, 21 hours ago:
"Update from the warehouse is they have a few hundred shipped out, but this is out of a total of 1600; going as fast as they can."
So I don't know, let's say they're shipping ~400 orders a day. Gestimate that, then add in UPS shipping time from a factory in Navada to your house. Maybe give 24 hours for Murphy's Law and general unluckiness. It all ads up to one thing- TOO LONG.