According to their official blog, Sony is currently rolling out updates to for their Sony Xperia Z1 and Xperia Z Ultra devices.
The flagship phone and the phablet were among the three devices introduced to the United States yesterday.
The Xperia Z1 will be getting a modified camera algorithm for better performance and refined Sony’s Smart Social Camera platform, so that “Xperia Camera apps run more smoothly (particularly Burst Mode, Superior Auto, AR Effect and Sweep Panorama…).”
The Xperia Z Ultra is getting “optimized touchscreen sensitivity, for both finger gestures and writing / sketching with pencils, metal pens and selected styluses”.
Sony also said they have improved battery consumption, data speed and re-calibrated the display so as to provide better viewing experience.Source