I love the classic playstation controller. It has been great for the PSX, PS1, and PS2, and because I (and sooo many other people - even PC-users with the logitech dual action controller is IDENTICAL to Sony's) am used to it, it will be great for the PS3 to keep the same design. There is no doubt that it will feel comfortable in the hands since people have already played with it.
But I dislike the motion sensor feature... it seems kind of stupid flailing your controller in the air just to throw a damn football or pass a hockey puck. It sounds pretty good for like an airplane game but it's not needed for majority of games.
-Hopefully they will prove me wrong