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Preorders for Apple Watch Series 4 begin on Friday, with units expected to ship on September 21.

The Apple Watch Series 4 features an overhauled design that includes a 30 percent larger display than previous models. The watch itself will also be thinner than the Series 3, meaning less volume overall, even though the screen is larger. Along with the release of the new watches, Apple is dropping the price of the Series 3 to $279. The default watch face, for example, now displays more complications (read: widgets), than ever before.

Whether this overloads things or ends up making the watch more convenient to use, we'll have to find out when we get our hands on one ourselves. With a revamped accelerometer and gyroscope, Series 4 is "ideally suited" to identify both motions, Williams said.

Cellular signals also get a boost thanks to some fiddling with the watch's new ceramic rear, so you can gabble into your watch like a nutty Power Ranger. It delivers an alert and calls emergency services if the user doesn't move for one minute after a fall, Williams said.

There's also a focus on detecting heart anomalies. The electrodes are in the rear of the Watch, built into the back crystal. The feature will roll out in the U.S. later this year.

He highlighted the health benefits of such a device by features such as automatically notifying users you if it detects they have an elevated heart rate.

"Identifying a fall may sound like a straightforward problem, but it requires a lot of data analysis", Williams said.

Apple Watch Series 4 Will Come in 40mm and 44mm Sizes

"The killer app for most who have been holding out has been longer battery life, something that doesn't require daily charging, and possibly a larger screen to make it easier to type on", he said. If a device can't make it through the day, then it's a huge pain. All this data, Apple says, will be protected, as the information is encrypted on the devices and in the cloud. Of course, your mileage may vary. The Apple Watch Series 4 is FDA-approved, runs watchOS 5 and comes with same 18 hour all-day battery life. Nevertheless, let's not overlook them.

In addition, Apple said WatchOS 5, which was unveiled at the WWDC event in June, will be available on September 17. To talk to Siri, you just have to lift your wrist.

Starting at $399, some £300, for the base version of the Series 4, the price hikes up to $499, around £389, for the cellular model.

The all new Apple Watch 4 features a bigger screen, all new features and several great reasons to place your Apple Watch 4 pre-order this week.

Pricing has gone up a little from the Series 3.

Apple Watch Series 4 comes in three aluminium finishes anodised in silver, gold and space grey.

It'll also be available through various carriers and third-party retailers, including exclusive retail partners such as Kohl's.