Nah, the Boomerang controller was kind of the prototype. It's what was orignially going to come out. However, there was a bit of a backlash kind of as people couldn't understand why they were changing the shape of one of the best controllers ever created. So Sony redesigned the PS3 controller so it was exactly like the PSONE and PS2 Dual-Shock controllers. They, however, removed the Dual-Shock from the PS3 controllers and incorporated the Tilt technology instead.
Lyndon will explain why they did this in case you're wondering.