Sure, the Xperia Z3 hasn't been out for that much time yet, but it's clear that Sony is already working on its successor. And it looks like we may have gotten a whole lot of details about the upcoming Xperia Z4.

All of the following reportedly comes from the same tipster that accurately leaked the Xperia Z3 Tablet Compact a while back. So that lends this info some credence, but it doesn't mean you shouldn't read this with a pinch of salt on hand.

First off, this source claims the Xperia Z3X doesn't actually exist. A device apparently bearing that name was benchmarked at the beginning of this month. If the Z3X isn't a thing, then that benchmark result might have been fake, or maybe that handset is some kind of development prototype that won't make it to the market. Interestingly though, the Z3X shares a lot of specs with the rumored Z4.

Which brings us to the Z4's innards. It's said to sport a 5.5-inch touchscreen with QHD (2,560x1,440) resolution, and a new curved rear camera sensor that will have about the same (20.7 MP) resolution as the ones in its predecessors.

Powering the Z4 will be a 64-bit Qualcomm Snapdragon 810 SoC, with a 2.8 GHz octa-core CPU (having four Cortex-A57 cores and four Cortex-A53 ones). The RAM will be upped to 4GB this time around, and the minimum storage space will be 32GB (double that in the Z3's base model).

The phone will sport Cat.6 LTE connectivity, for theoretical peak download speeds of 300 Mbps, and Bluetooth 4.1. There will also be a dedicated amplifier on board for better sound quality. The design of the Xperia Z4 will be very similar to that of its forerunners, still the same Omnibalance language employed yet again.

Interestingly, Sony is said to give up on its six-month release cycle for flagship handsets starting with the Xperia Z4. So far, it has been the only company to push out two flagships per year - take the Z2 and Z3 from 2014, for example. But that's rumored to change, with the Z4 not being followed by a Z5 in 2015.

The Xperia Z4 is apparently going to be introduced around March next year, probably at Mobile World Congress.

Thanks for sending this in, KF!

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