Sony hasn’t said anything about the kind of rumble to be supported in the new DUALSHOCK 3. So it’s up us to finagle details out of articles like this one. 1UP does a write-up on MGS4, and they mention the controller’s vibration function in passing:

We did enjoy the various rumble effects employed by the new Dual Shock 3 controller, though: As explosions rattled around Snake, we could actually feel the direction from which they were coming based on what part of the controller virbated.

It’s been so long since I felt rumble that I forget. Could the PS2 rumble like this? Or does this indicate new rumble functionality we haven’t had before?

Metal Gear Solid 4 PS3 Preview, Metal Gear Solid 4 Playstation 3 Preview