I think the question should be "Is the new iPhone gonna have 4.6 BL?"
My guess is 99.99999% no.
Remember how long it took geohot to find a solution for the 1.1.2 OTB?
This one might not even be doable by software...who knows.
If the new iPhone is not available to buy without a contract, do you guys think that the *old* ones will keep their value?