i dont think retailers will raise the price just becuase a feature is unlocked. at the end of the day we buy in at X, mark it up a little and sell it on. upping the price would be a bit mean.
if anything I think retailers would advertise the extra possible features in order to get people to buy the, in the same way that soft mods of video cards often happen.
Back in the day when there was a batch of ATi 9500's that would function at 9700 spec the same happened, i dont think prices went up.