If you're about to upgrade your smartphone, HTC's latest flagship is one to consider. The new HTC One M8 - see our hands-on review - is an update to last year's HTC One and improves just about everything.

As well as a performance boost from the quad-core SnapDragon 801 processor, there's also a new co-processor which lets the One M8 perform some nice tricks. One is the ability to monitor your movements as you travel, logging your activity in the pre-loaded Fitbit app.

It can also enable low-power monitoring of the screen. A double-tap on the screen (when off) will show the time and notifications, while swiping left or right can launch certain apps.

The extra processing power also helps to give you sharper photos, and the Duo Camera at the back works like a Lytro camera, allowing you to re-focus the image after shooting.

The latest version of HTC's Sense interface - 6.0 - doesn't seem to slow down the smartphone and you also get HTC's BoomSound for better audio.

The new 5in screen is slightly bigger than before, but resolution stays the same at 1920x1080.

Storage, for the European model at least, is just 16GB, but a microSD slot lets you insert up to 128GB of extra storage, and you also get 65GB of free Google Drive storage for two years - not a bad deal.

We'll bring you a full review of the HTC One M8 as soon as possible.

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