It's no secret Apple has been working on a firmware update (due out sometime this week), but the fact it may render an unlocked iPhone completely useless (unless of course you are need of a $300 paper weight) is somewhat surprising. "We are not doing anything proactively to disable iPhone's that have been hacked or unlocked," Phil Schiller, Apple's head of worldwide product marking told Reuters. Who really believes that statement? 

So it seems pretty clear to me that anyone who is currently using an unlocked iPhone should not perform the update until there is a definitive answer as to how the phone will be affected or when a new hack is available (hint: iPhone Dev Team).