I just ordered mine today. It gave a ship time of 3-5 weeks. Ship date of 09/07/10, delivery date of 09/10/10. I suspect it will ship must faster then the estimate I was given.
I ordered mine the first day the bumper case app was in the app store and i just got mine yesterday aug 2nd. it was a big surprise when i saw it for sure!
I ordered my bumper the morning of the first day the app went live. It showed a projected shipping time of about a month, showing the projected delivery date of September 3rd.
That being said, I had the bumper in hand one week from when I ordered it.
"prepared for shipping" (from China to a fulfillment center in the US). Early September sounds about right for arrival in your mailbox