Sony's high-end Xperia Z3 is barely a month old, introduced at the IFA technology trade fair in Berlin, but rumour mills are abuzz with news that the Japanese tech major is already planning its next flagship.

No bi-annual flagship models

It is also reported that the company is planning to put an end to the bi-annual flagships that Sony started with the Xperia Z and Z1 last year.

Sony Xperia Z4, the successor of Xperia Z3, will be the only flagship offering from Sony for 2015, according to Android Origin, which has been tipped by the same source who previously revealed exclusive details about the Xperia Z3 Compact.

The reason for Sony's plan to come out with just one flagship in a year, could be because the devices have reached a certain saturation point with no major upgrades that can be made in the duration of six months.

No Xperia Z3X, only Xperia Z4

The source further dismisses the rumour about a new variant of Xperia Z3, known as Xperia Z3X, and asserts that Sony's next flagship will be Xperia Z4, set to debut in March next year at the Mobile World Congress event in Barcelona.

Sony Xperia Z4 specs

The octa-core Snapdragon 810 processor, with 64-bits support, clocked at 2.8GHz will be the power house for Xperia Z4. The octa-core CPU will be paired with an Adreno 430 graphics unit. The 16GB internal storage, a usual storage feature that started with the Xperia T and continues up to the current Xperia Z3, will see an upgrade to 32GB through the Xperia Z4.

More interestingly, the smartphone will pack 4GB RAM and will be the first in the Xperia lineup to support LTE Cat.6 connectivity and Bluetooth v4.1.

Sony will drop the IMX220 20.7 megapixel camera sensor which is in use since the Xperia Z1 and go for a curved Exmor RS CMOS sensor having similar resolution in the Xperia Z series flagships.

The Xperia Z4, in terms of design, will feature the same omni-balance build and will look similar to the Xperia Z3. The new Xperia model will be bigger than its predecessor with a 5.5in screen of Quad-HD resolution at 2560 x 1440 pixels. Besides, there will be a dedicated amplifier for better audio quality.