Innerbits.com report that there are Several fresh items of news today, regarding the PS3 controller:
"We can confirm that prototypes of the new rumble-enabled controllers have made their way to various Sony developers. Information on these controllers is still closely held by Sony and their partners, but an official announcement and unveiling is expected in the next two to three months. Leipzig is the most obvious guess for this unveiling, but we believe Sony is going to withhold the controllers until they can launch them to coincide with support from enough developers.
We can also confirm that new versions of the Sixaxis controller are quietly replacing the original controllers launched with the console. Hardware updates occur regularly throughout the lifespan of controllers; in this case, Sony has improved the fidelity of motion sensing in the controller. The original controllers apparently suffered of too much of a dead zone."