The interface can withhold up to eight customizable complications, which makes it the "ultimate health and fitness watch".
More complicated Apple Watch facesLook at all those options!
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.
The series four also features a leather collaboration with watch brand Hermés that cost more than $2400.
And the new dynamic watch faces positively dazzle on the large new display. It is powered by the new dual-core 64-bit S4 processor, that the company says offers two times faster performance.
The new watch can detect if you have taken a fall and call emergency services.
There's also a focus on detecting heart anomalies.
The third feature is made possible by the electrocardiogram on the back. The data is reliable enough to be used for medical purposes, although the feature won't be available until later this year. The process will take about 30 seconds and then the user will receive a heart rhythm classification. Apple even brought the American Heart Association's president and practicing cardiologist Ivor Benjamin on stage to tout the feature and its ability to evaluate your heart and find risks to possible heart issues.
Additionally, through new accelerometer and gyroscope hardware, the Apple Watch can detect hard falls by analyzing wrist trajectory and impact.
We loved the Apple Watch Series 3 when we reviewed it at Express.co.uk. Of course, your mileage may vary. Apple claims the Watch Series 4 will still run for 18 hours in everyday use, while workout tracking will be possible for as many as six hours.
Announcing the launch, Apple chief operating officer Jeff Williams said the company had received clearance from the Food and Drug Administration (FDA) in the USA to allow the product to be used as a medical device. Nevertheless, let's not overlook them.
iPad may also get some attention, with two new and improved models possibly on the schedule. The new smartwatches are bigger than what we have seen from the company in the past.
Many users have held onto older Apple Watch models, and this represents a massive change to the device that could convince users to upgrade. The Apple Watch 4 is $399 and $499 with Global Positioning System as starting prices.
Apple has unveiled a new smart watch at their annual launch event that is not just faster and sleeker but also capable of saving lives.
Pricing has gone up a little from the Series 3.
This time around, there will be both GPS-only and cellular variants again, along with the usual Nike and Hermès collaborations.
Maps, photos and calendars were also redesigned in the watch, which will come in space gray, black and gold aluminum.