Improvements on PS3's controllers are on-going, but there are no rumbles as of now. "We have not added rumble [to PS3], and have no announcements regarding this feature," said Dave Karraker, Sony's director of corporate communications.
While it's true that developers received prototype controllers of sorts, they weren't rumble-enabled. According to Karakker:
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
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