I've pre-ordered the iP5 and it looks as if I won't be able to get some protection on it from day one. My only other launch day Apple device was my 3GS, however since it had the same form factor as the 3G there where no issues finding cases for it.
I've pre-ordered an OtterBox Commuter which ships out on Friday (same day the phone arrives). I'm thinking I'll leave that protective film on the phone until the case delivers, and since the headphone jack is on the bottom no ports should be blocked by the film.
I was hoping to find a decent case by Friday and cancel my OB pre-order.