Sony's current flagship device, the Xperia Z3, has just begun reaching various markets across the globe. Still, Sony doesn't look like it's slowing down; it's up on its toes again for next year's flagship device, which is said to carry the moniker Xperia Z4.

The upcoming Xperia Z4 negates the rumor that a device known as Xperia Z3X purportedly exists. Now, Sony confirms that the company is actually working on the Xperia Z4 set to launch in March 2015.

Perhaps the company will unveil the device at an international event such as the Mobile World Congress, which has an annual attendance of between 70,000 and 80,000 people.

The release next year will be different from the company's past launch events. For two years now, Sony has been doing two flagship launches each year as seen in the way it launched the Xperia Z and Z1 in 2013 and the Xperia Z2 and Xperia Z3 in 2014. This year's launch has witnessed a marginal upgrade between the latest devices, and the only notable changes were focused on software and hardware enhancements.

The rumored specifications of the new Sony Xperia Z4 are said to be a major upgrade from its older sibling, the Z3. Currently, the Z3 features a full HD display of 5.2 inches and a quadcore Snapdragon 801 processor.

However, the new Xperia Z4 is said to feature a 5.5-inch QHD resolution display at 1440 x 2560 pixels. It is ditching the IMX220 camera sensor in favor of a better version, though, the name of the new sensor is still undetermined. This is absolutely good news for many original equipment manufacturers such as Motorola, LG, Samsung and Apple, which use the camera sensors from Sony on their devices. The new flagship device will use a 27-MP camera and a 10-MP front camera.

Unlike the Z3, which lacks the 64-bit support, the new Z4 will have a 64-bit quadcore Qualcomm Snapdragon 810 SoC that is clocked at 2.8 GHz. Other notable features of Xperia Z4 include a GPU of Adreno 430, a RAM of 4 GB, and a minimum storage upgrade of 32 GB, which is a break from the norm of having 16 GB on Xperia devices.

The upcoming flagship device is also purported to have Bluetooth 4.1 and Cat. 6 LTE connectivity, which will be the first time it is featured in an Xperia smartphone. Moreover, the new Z3 is rumored to feature Android 5.0 Lollipop for its OS.

One of the major changes in the design of the Xperia Z4 is the added amplifier to boost the sound quality. It's not known whether Sony will start focusing on enhancing the sound quality of its future devices enough for them to compete with HTC's BoomSound front-facing speakers found on most of its handsets.

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