Joystiq cites speculations that Sony’s upcoming Playstation 3 console may not actually be a hundred percent backwards-compatible as it was touted to be. This means PS3 users would have to say bye-bye to their current crop of PS2 and even PS one games, and then upgrade to PS3 versions, if they still intend to play [...]
"PS3 Not Fully Backwards-Compatible" - 25.04.06