I think they should do what they always do.
Just tweak it for the next console.
The Dualshock improved on the Playstation 1 controller by adding rumble and 2 analog sticks.
DualShock 2 added L3 and R3 along with pressure sensitive face buttons.
DualShock 3 added Tilt control, the PS button and .10 degrees of analog control.
(I'm leaving out the SixAxiS because to be it never should have exsisted)