antonichen: Sony stopped production of the 60GB awhile ago. Sony isn't officially cutting the price of the 60GB, but retailers might (after the 40GB launch) if they still have any in stock.
The 80GB model is still the MotorStorm bundle, but it has software PS2 emulation instead of hardware like the 60GB. Hopefully they don't phase out the 80GB model like they did with the 60GB, so people who want backwards compatibility at least have a choice.