The new PlayStation Portable model (PSP-3000) is released next week with rumors suggesting that PlayStation Network access will be included. In order to keep older PSP models up-to-date, a new firmware version is expected next week. Several sources are reporting that a new firmware update is imminent, but whether it is firmware 5.00 or 4.20 remains to be seen. Around the same time, a new firmware version for the PlayStation 3 is also expected to be released.
Until Sony confirm this story, it should be taken as a rumor. We will bring you more details on this story as we get it.