The Sixaxis will rumble again
According to GameDaily, Sony and Immersive have reached an agreement about the force feedback technology used in the Playstation controller. The “rumble” technology was initially removed from the PS3-controller due to a lawsuit, but the two companies has now “entered into a new business agreement to explore the inclusion of Immersion technology in PlayStation format products”.
This will probably mean the PS3 controller will rumble again in upcoming versions.
(Thanks to PSUbuntu Forum user Eidan for the link)

