It's rather like the 360, in a sense.

Two versions - the crap version, and the version with everything else.

And here's an interesting thing. Just been reading an intervioew with Phil Harrison, and he said that the HDD in the PS3 are your bog-standard PC HDD. So you can upgrade it with whatever you wish.

But if Sony are still planning to put Linux on the PS3, wouldn't you need to install it on the new HDD?