I don't think this is true for the + models. I think even early pre-orders (at least the majority of them) are auto 4-6 week delay. I don't think Apple had the stock for Sprint for release (for the + models).
WTF, I talked to Sprint on the phone, and they told me none of the stores would have the + models in. Hah. And they also told me I couldn't cancel my order and just get filled in store. WTF.
Typical Sprint BS ill just go off a You never know approach from now on, but I will be waiting in line on friday if I don't get a tracking number anytime soon...