That isn't even possible at the Apple store in Cleveland. It's in a trendy little mall area called Legacy Village and they have a sign listing rules for camping.
They are as follows:
Rules and Regulations for Apple iPhone Release
1.Overnight parking at Legacy Village is prohibited.
2. No tents, sleeping bags or camping will be allowed.
3. Line will form on Friday, June 29th beginning at 6 AM.
4. The holding or saving of spaces in line is prohibited.
5. Any disorderly or unruly behavior while in line or on property will result in immediate removal from Legacy Village.
6.Legacy Village is privately owned and reserves the right to enforce rules and regulations in our code of conduct.
I guess it's a good thing seeing that the most you will wait is 12 hours. I can just see the mad rush at 6.