Kotaku asked for and received an official response from Sony regarding the FCC document found yesterday that showed a possible 80GB PS3. The filing was for a change to the WiFi/Bluetooth module, but showed an 80GB PS3 listed along side the 60GB version.

The Sony response to Kotaku was "As mentioned when we made the product announcement for PS3, the system will have different configurations (thus, 60GB HDD with memory card slots and Wi-Fi and 20GB HDD without memory card slots or Wi-Fi both exists). Application to the FCC has been made with various possibilities in mind, however, it does not lead to a new product announcement at this time."
So they are saying basically they could do an 80GB version of the PS3, but they aren’t announcing it just yet. Then again if the only change is another 20GB of space it’s not that big a deal to current owners of the PS3 since you can already to change to larger hard drives yourself, but it offers new choices for those not owning a PS3 yet. Story via Kotaku