I haven't seen that, but since they haven't changed the 'wet ends' the only change that they can make is in motor efficiency. Changing that isn't going to produce a visible improvement in your electric bill.
Nothing they can do with motor efficiency approaches what's already been done with motor speed: on low speed, a pump ALREADY moves 1/2 as much water for about 1/6 the electricity (300% efficiency increase). With a VS pump, you get BOTH the very large efficiency improvement from speed changes and the maximum efficiency improvement from motor changes. (A VS pump motor is the MOST efficient electric motor you can currently get on a pump).
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