Walked into my AT&T store at 9am, they had plenty 32gb grey iPhone's... the demand isn't there this year, I really don't think the demand is there this time around - the iPhone 6 will be a different story though.
The demand is there. But people want gold and silver. They had very limited stock of those on launch.
I suspect a lot of people bought gray phones yesterday and will return them to get gold and silver within 30 days. just a hunch based on who I talked to in line.