Liz has had plenty of opportunities to say "The RaspPi will not be going on sale at 6am". That would not interfere with any contract that I can imagine. She has not said that, in fact she has gone as far as possible in the direction of giving the impression that the "news" is the opening of sales.
If the shop does not open at 6am, then there are a lot of people who are going to feel they have been misled, and Liz is astute enough to know that. The Foundation does not need bad publicity hours before launch.
I will therefore have my Paypal account ready at 6am and hope to be able to use it.
