Sprint has issued PRL 20216 for EV-DO enabled devices. Call *2 to have your line flagged for update if you have an EV-DO device. Unlike PRLs in older devices, EV-DO PRL files may make modifications to the available HDR channels, improving EV-DO signal acqusition.
The PPC-6700 currently has an issue that may require you to call *2 multiple times in order for the PRL update prompting to appear and the PRL to download properly. You will know the PRL is downloading via text below the airtime display in the call, and you will be prompted to reset the device when it has installed properly. If neither happens, call back and *2 will start the update process over.