The announcement was made on from Sony Mobile's global PR team's Twitter account, saying, "#android 4.4.4 rolls for #Xperia Z, ZL, ZR & Tablet Z - brings fixes, battery, wifi & email improvements and more #SonyXperia."
Sony hasn't provided the detailed changelog or time frame for the Android 4.4.4 KitKat update as yet, however on Monday the update has reportedly (via Xperia Blog) started rolling out to the LTE version of the Xperia Tablet Z (SGP321) on Vodafone carrier in Europe. The blog also reported that the Xperia Z smartphone users in France have also started receiving the update on Tuesday.
In May, Sony had rolled out Android 4.4 KitKat updates for the Xperia Z (Review | Pictures), Xperia ZL, Xperia ZR and Xperia Tablet Z (Review | Pictures). It had also brought the revamped Sony native app portfolio with the new Android 4.4 KitKat which included Messaging, Email, Smart Social Camera and Battery Stamina Mode among others.
Last week, the Japanese giant announced the Xperia Z3, Xperia Z3 Compact, and Xperia Z3 Tablet Compact at its pre-IFA 2014 event in Berlin. The company also announced the two new wearables - the SmartBand Talk and SmartWatch 3 - in its SmartWear Experience range.the E-mount ILCE-QX1 and DSC-QX30, priced at $400 (approximately Rs. 24,000) and $350 (approximately Rs. 21,000), respectively - were also launched at the same event.