Well, that's weird. I notice that online there's only a 24 hour shipping option, so I called Apple, explained to them that I wanted to pick up today, went through the ordering process, and then they told me that the new MacBooks aren't in their system as available for delivery until the 31st.
Maybe I'll just have to wander down to the store and see.
Maybe I'll just have to wander down to the store and see.