Sony Xperia Z3 Series devices
Sony Unveils New Z3 Series Xperia Smartphones, Tablet, Smart Wearables at IFA 2014Sony Mobile

The much-hyped Sony Xperia Z4 may have received certification from Indonesian authority which could pave the way for its release. It has in fact given a hint that official announcement of the device could happen soon.

The Sony Xperia Z4 is expected to be unveiled at the upcoming Mobile World Conference 2015 (MWC 2015) to be held in Barcelona from 2-5 March. There were rumours that it would be announced at the Consumer Electronics Show 2015 (CES 2015) but it didn't happen.

Indonesian Postal Regulatory that deals with certification of electronics devices, has approved three new Xperia models - E2353, E5333 and E6533 – and the E6533 models is believed to be referred to Sony's upcoming flagship smartphone, the Xperia Z4, according to a report by Xperiablog.

The website claimed that E6533 is very likely to be the Xperia Z4 going by the model members of its predecessors - Xperia Z2 with model number D65xx, and Xperia Z3, D66xx – with the letters indicating the year of release. It went on to claim that the E2353 could be the successor of the Xperia M2 with model number D23xx, and the E5333 could be a mid-range device.

The same website had earlier reported that the Ministry of Internal Affairs and Communications in Japan has certified the device, and the Federal Communications Commission (FCC) has also approved one device which could be the Xperia Z4.

There are conflicting reports on the features of the next-generation smartphone with some claiming that it would sport a 5.2-inch screen with 1440 x 2560 pixel, while other claim that it would have either a 5.4-inch or 5.5-inch screen. GSMArena reported that the device would have features like water resistance, Snapdragon 810 chipset, Android 5.0 Lollipop, 20.7MP camera, and 3,400mAh battery.