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I think they are making changes to the Model 3 pages in anticipation of tomorrow's event. My Model 3 page changed, disappeared and reappeared. I wouldn't sweat it.
There was a leap of faith to deposit in store before the reveal. I always thought the people that ordered online after the reveal stream weren't quite as "faithful".
I'm in Pittsburgh, and I reserved in a store on 3/31. Early. I was third in line. My reservation page says 3/31. I do not have that "invited to configure soon" message yet.