Speaking to Kikizo, Sony's Kaz Hirai has implied that Sony are potentially going beyond more than just adding rumble in the next version of their SIXAXIS controller for PS3. He commented that Sony will come out with an announcement when the time is right and that that it has always been an evolving peripheral.

Kikizo: One thing that you and I spoke about last time, which led to maybe a bit of awkwardness afterwards, was about the Sixaxis, motion, and rumble. But you guys have now reached an agreement with Immersion I believe. When do you think that we may learn more about a product that reflects this agreement? (I.e. - an official rumble-enabled Sixaxis controller for PS3)

Hirai: Uh, well that's something that I know the consumers have told us they're looking to have in the PS3 controller, it's something that we're obviously looking at, now that we've reached an agreement with Immersion. We're also looking at a variety of other things that we can incorporate with the controller, and we'll come out with announcements when we think we have the right mix of features for the PS3 controller. I mean, as you know, that's also an evolving peripheral, if you will, in that we started out with the original PS1 controller with no analogue, and it's come all the way to this point, so obviously, as we go forward, it's not the final model for a PS3 controller, so we'll see what comes down the road.