It's like a catch-22 for people who want the phone early but aren't sure of which size they want yet 
Either you:
A) Pre-order whatever size is your best guess and just hope it works
or
B) Wait to try one in stores first and have Apple delivery times jump up to 3 - 4 weeks
Sucky
Either you:
A) Pre-order whatever size is your best guess and just hope it works
or
B) Wait to try one in stores first and have Apple delivery times jump up to 3 - 4 weeks
Sucky