I spoke with the Intel folks, Cingular and RIM folks at the SF event and asked that specific question. With a grin they all said that the phone is upgradable to UMTS, HSDPA in particular and Cingular told me the traget was a true 700kbps rate anywhere you had a signal as opposed to the higher theoretical rates that are only achievable if you are standing under a tower under perfect conditions and the only one using the network.