While there are other ship designs with two gas turbines, some Japanese ships are examples of that, such designs will have worse fuel efficiency than mixed gas turbine and diesel designs, or designs with mixed gas turbine and electric design. The main advantage of such schemes is higher peak power output and ship speed for anti-submarine warfare close to shore. So yeah while that is also a possibility, given the tendency of Chinese civilian ship design as of late to be more evolutionary than revolutionary, I think it is more likely we will see a combined gas and diesel propulsion scheme. But I could be wrong.