Would be interesting to see some specs/measurements to substantiate their proposed energy savings -- without an insulated heating vessel it's hard to believe this is more energy efficient than existing technology.
It seems the biggest efficiency comes form heating much less water in the first place. Given that a typical cup of tea will stay hot for several times longer than the time spent heating it, the lack of insulation should be more than made up for by heating less water.
But, yes. Specs and measurements are required to substantiate specific claims.
Also, it's hard to believe that this would substantially decrease the amount of water heated. If you were super anal about only heating the water needed, then that's do-able with a tea kettle. If you're not, then even under the new model you would probably just use a kettle or pot most of the time.