Sprint has issued PRL 60613. As with past Sprint roaming updates, no change list is immediately available. However, Sprint encourages all users to upgrade, even if you do not frequently roam. New PRL files contain EV-DO authentication strings, as well as data roaming enhancements.
To update your PRL, call *2 from your phone and ask customer service to flag your account for update. Some new-model Sprint phones also have a PRL update option in their Tools menu.