Update: Inital reports have been incorrect, PRL 10027 has not been released. Instead, PRL 20007 was released for EV-DO only devices. What is more troubling is that Sprint has informed some technicians not to install this PRL on the PPC-6600 Series.
Some have even gone as far as to report that the PPC-6600 will never be updated to support EV-DO, but we are not confirming that at this time. So, to wrap this story up, PRL 20007 has been issued to Sprint Stores, but at this time is only for the AirCard 580.
Sprint is expected to begin deployment of PRL 10027 tomorrow. This PRL will enable EV-DO in all devices that support it. While the PRL generally refers to roaming, carriers have modified the PRL to provide network feature status, such as with EV-DO.
Sprint generally takes time to deploy PRL releases properly, so why PRL 10027 may be released, customers may not be able to get it over-the-air immediately. We will you informed as to when it is available.
Adding EV-DO support in the PRL does not mark the official launch of EV-DO, there is no guarantee as to available EV-DO coverage anywhere from Sprint at this time.
Note: The only devices that could potentially support EV-DO at this time are the PPC-6600 Series and the Sierra AirCard 580. Sprint will announce much more about EV-DO, including coverage and handsets very soon.