Sony first released the Xperia Z4 in Japan last April. However, the tech company recently announced that Xperia fanatics will see a different name when the device launches globally in June. When that time comes, the handset will be named Xperia Z3+, which is identical to the already released Z4.

Amid a number of confusion, Sony issued a statement clarifying the reason behind the name change.

"The main reason for the name difference here is down to Sony being such a dominant force in the Japanese market [where] consumers crave flagship devices with the latest features as soon as they can be delivered," a spokesperson for the tech giant explained, as quoted by Android Headlines.

Sony's spokesperson continued, "Xperia Z3 continues to perform well as our flagship device across the rest of the world. To address those customers that would like to have the very latest features and refinements, we have introduced Xperia Z3+ as a premium addition to our existing flagship Z3 series."

Now the question plaguing the minds of some is this: What is the name of Sony's next flagship going to be? Sources say that it won't be labeled Xperia Z4, and instead will be called Xperia Z5.

We rounded up the rumors about the Xperia Z5 and compared it with the Xperia Z4. Note that these are unconfirmed at the moment and an official announcement from Sony is yet to be had about the Xperia Z5.

Specs & Features

XperiaZ5Sony.com claimed that the Xperia Z5 will come in at a 5.5.-inch screen display and 4K ultra HD resolution. The handset is also said to have octa core processor 64bit Qualcomm with 3.2 GHz clock per cycle and a 4GB RAM space.

For its camera, the device will have 30 MP with G+ sensors for its primary shooter and a 10 MP with face detection front snapper, XperiaZ5Sony.com noted. Aside from these, the smartphone will have 128 GB internal storage, 4500 mAh battery with fast charging capability, finger print sensors, Retina scanner, and gravity sensors.

We previously reported that the Xperia Z5 is expected to arrive with two other companion devices -- the Xperia Z5 Ultra and the Xperia Z5 Compact. The handset is also rumored to take inspiration from Sony Bravia TV's "frosted glass" effect.

The Xperia Z4, in contrast, comes in at 5.2 inches with 1080 x 1920-pixel resolution, GSM Arena wrote. It runs using Quad-core 1.5 GHz Cortex-A53 and Quad-core 2 GHz Cortex-A57, with a Qualcomm Snapdragon 810 chipset. For its memory space, the Xperia Z4 has 32 GB internal storage and 3 GB RAM.

Other features include a 20.7 MP primary camera with LED flash, a 5.1 MP secondary shooter, and Android Lollipop 5.0 as its OS. The handset is at 6.9 mm thick.

Price

XperiaZ5Sony.com speculated that the Xperia Z5 will be priced around $1000.

The Xperia Z4, in contrast, is said to cost more than the Xperia Z3, which is now at $843. The device is expected to be released alongside the Xperia Z4 Tablet announced last March.

Release Date

The Xperia Z5 could be released in September 2015, XperiaZ5Sony.com noted. Ecumenical News, meanwhile, said that the device will arrive in January 2016.