No new curved sensor for the Sony Xperia Z4?

Several months ago Sony presented a new curved sensor with better sensitivity and overal image quality. It was tipped that the sensor will be found in the Sony Xperia Z4, but the latest news say NOT. The camera sensor will be the IMX230 which has a phase detection and is a little bit improved over the sensor in Sony Xperia Z3, so it's only a little step forward. Anyways sony should really focus on imrpoving their camera software algorithm too which is the worst among others (like Samsung and Apple).