After some concerns about the lack of “modularity” on the lower-priced version of Sony's PS3, Sony has come out to qwell some fears. As it stands, many of the features that it will lack could be later added on, putting Sony basically in between PS3s and common modders. They had this to say:

"Both configurations will support bluetooth PS3 controllers. The only non-upgradeable feature of the 20GB configuration will be the HDMI output."
They will also be able to have the drive replaced and upgraded as well from the stock 20GB to whatever size the hardware itself supports, with Sony saying “it is a computer, after all”. There will also be another adapter allowing the use of MMC/SD/CF and other type cards. Good news for those looking to cut down on the cost of consoles, with how outrageous it has become.