Steve Jobs just announced at MacWorld that the new firmware for the iPhone comes out today. It appears consistent with the leaked firmware that came out a couple weeks ago. Remember, if you are unlocked, you might not want to update. You better wait awhile or you could have a useless iPhone! Here is the download link for the new firmware which is 1.1.3 by the way. Yes the baseband is updated it is version 04.03.13_G.
iPhone nano