Sony's Xperia Z3+
Sony announced the Xperia Z4 for Japan last month, but this isn't it. Well it is, but internationally Sony wants it to be known as the Xperia Z3+.
Truth be told, that's a more appropriate name for the phone, given the incremental upgrade it represents over last year's model. The Z3+ may look virtually identical to its predecessor, but internally it has almost everything you'd expect from a 2015 flagship.
As you'd expect, the Z3+ is powered by Qualcomm's best, the octa-core Snapdragon 810 processor paired with 3GB of RAM, which should keep Android 5.0 chugging away nicely when compared to the Z3's 801. In order to reduce the Z3+'s dimensions (it's 6.9mm thick, compared to 7.3mm last year) the battery has been cut from 3,100Ah to 2,900mAh. Hopefully the 810's four low-power cores will mean that reduction won't affect real-world battery life -- Sony isn't sharing usage figures yet, only declaring "up to two-day battery life."