One thing for sure, the controllers are definitely going wireless, which is a good thing. I can't stress how much I hated the length of the cord, since I play in the living room.
There's been word that with the HDD add-on, the PS3 would be a supercomputer with the capability of powering multiple-OSes, but all these are still FUD or rumour for now, we will hav to see it with our own eyes. But one thing for sure, Linux would be bundled with the HDD-add on, which is wat Ken Kutaragi said himself.
Really can't wait for the PS3, which is like less than one year away from now.