Mr. Karraker came back with saying that they have merely made minor adjustments to the motion sensitivity of the controller that is part of a natural evolution of controller technology. "From time to time, we make minor enhancements to the controllers for our platforms. We recently sent out to the development community some new prototypes that have a slightly enhanced sensitivity for the analog sticks and the motion sensing within the Sixaxis controller. This is not a new controller, but is part of the normal development and evolution of controllers."
Sony has received much criticism for omitting the rumble feature from its current generation console controller. Fans of the feature can remember its benefits as far back as the Nintendo 64. Despite critics however, Sony remains glued to its original statement that rumble is a last generation feature and not a next generation feature.
Source:
PCWorld