UPDATE: Autoblog spoke with Infiniti spokesperson Nick Twork, who clarified some of the details originally outlined in this story. First, all current Q50 models without Direct Adaptive Steering use hydraulic power steering. The proposed new system would be adapted from the previous G37S, which used a variable-ratio hydraulic steering rack. This is the one that could potentially be used in the Q50S for the 2016 model year.
Since Ford is replacing the entire engine lineup for the 2011 F-150 pickup trucks, it has apparently decided not to reinstall at least one component that is usually bolted to those engines: the hydraulic power steering pump. According to PickupTrucks.com, the updated models will be the first full-size trucks to use electric power steering (EPAS) almost across the board.
In recent years, electric power steering systems (EPAS) have rapidly been supplanting older hydraulic systems as a means of reducing both weight and parasitic losses. Until now, most of the EPAS applications have been on small- to mid-sized cars.