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

Sony is expected to unveil a series of products at the upcoming Consumer Electronics Show 2015 (CES 2015) to be held on 5 January at Las Vegas but the most prominent devices expected at the event is the Xperia Z4 and Xperia Z4 Ultra.

There were also reports that the Japanese electronics giant might unveil the Xperia Z4 and Xperia Z4 Ultra at the Mobile World Conference 2015 (MWC 2015) to be held in March but the devices are very likely to make it early, as Sony has scheduled a conference at the CES event.

Expectation on the Xperia Z4 is high following the stupendous success of the Xperia Z3. The next-generations smartphone may have several feature upgrades over its predecessor but gadget lovers may still want more.

Here are some features prospective buyers might want in Xperia Z4:

1) Display: The Sony Xperia Z4 is expected to sport either a 5.4-inch or a 5.5-inch screen display, according to latest report. However, many Sony fans may want the company to retain 5.2-inch screen seen in the Xperia Z3, as it won't be comfortable to hold a 5.5-inch handset.

2) Processor: The Xperia Z4 will reportedly have a Qualcomm Snapdragon 805 processor, an upgrade from Qualcomm Snapdragon 801 that powered the Xperia Z3, but gadget lovers may want a Qualcomm Snapdragon 810 in the device.

3) Memory: There were reports that the Xperia Z4 will come packed with 32GB internal memory and 4GB RAM but without microSD card slot. However, prospective buyers of the next-generation smartphone may want microSD card slot in the device. 4) Battery: The Sony Xperia Z4 may house a 3420 mAh battery compared to Li-Ion 3100 mAh battery seen in its predecessor but gadget lovers could be left disappointed with a battery lesser than 4000 mAH as increased screen size and resolution will consume more power.

The Xperia Z4 is expected to come with several other features, including Qi Wireless Charging but nothing is confirmed as of now with Sony keeping a tight-lip on the device.