It could really go either way, although I can see it being 1.1.1 They would load up new iPhones with 1.1.1 before it was released as a software update, Granted they would not ship these ones until the 28th.
i would acctually say that opposite (all opinion tho) and say that i think you have a great chance at receiving a firmware that is not 1.1.1 but depends on when they ship.... if its within this coming week you should be fine i think