The boomarang controller idea got scrapped I believe because no one likes it.
The new one looks almost exactly like the PS2 version yet with a guide button (Like the Xbox 360) in the middle, and a USB port at the top for plugging it in to recharge, and to play wired (otherwise, wireless).
The two back shoulder buttons are also a bit bigger and have more precision (10 bits of pressure, rather than 8 for racing games for example).
The shocks now though have been taken away (a big change), and there will be NO vibration on the controller.
Instead, a 6 way movement sensor has been put in it (almost like Wii, but with no position sensors so won't work the same way). This is left and right motion, up down, and tilt I believe.
The reason vibration was took away, they said, was because of the movement sensor not reacting well with the vibration, and so they decided the movement was a better soloution to games.
The real reason I think is because of that courtcase they lost about the vibration.
But yes, the old boomerang controller has now gone.
More word on the new one here:
http://uk.ps3.ign.com/articles/705/705934p1.html