Probably a continuation of the new engines that are going onto the Solestic Class ships which had previously been announced. Someone could correct me if I'm wrong, but some believe that this will solve the pod problem. I think they are not related but could be wrong.
No, the installation of diesel generators will not do anything to solve the pod problem. The diesel generators will be nothing more than an alternate source of electrical power. I'm not familiar with the configuration of the electrical plant on these ships, but I'm guessing that the plant is split with some gas turbines supplying the propulsion pods and others supplying base (hotel, navigation and communication systems, etc.) electrical loads. The company expects that the diesels will be more efficient than the gas turbines in enough situations so the savings in usage of fuel will more than offset the cost incurred to buy and install the new generators.