While all eyes and ears were trained on news of its smartwatch, Apple also used its spring Keynote to introduce changes to Apple TV, revisions to its laptop lineup, and a new service that builds on the health monitoring aspects of smartwatches to perform data collection for medical research.

As one digital TV service after another launches many have been left wondering when HBO, whose television dramas are highly sought and widely watched properties, would play its hand. And here it is: a partnership with Apple that makes the entire HBO back catalogue available through the new HBO Go digital streaming service, available exclusively through Apple TV. So while the Apple TV hardware hasn’t been updated for years, the partnership with HBO (and a price drop to £59) is a nice reminder for those who may have overlooked it.

Apple has extended its reach into car dashboards with CarPlay, into home automation with HomeKit, and into health monitoring with HealthKit. Apple hopes that ResearchKit, a new open-source API and service, will form the foundation for apps that can collect health data from larger numbers of volunteers, increasing sample sizes and frequency of data collection, making the data more useful for researchers. Five apps have been developed so far, to investigate Parkinson’s Disease, asthma, diabetes and cardiovascular disease with research groups in leading hospitals. There is an emphasis on privacy, with the user controlling the degree of information that is being shared.

The new Macbook – neither Air nor Pro – comes with the latest retina display, a faster, more energy efficient processor, and a trackpad that can supply tactile feedback. In a 12" format that fills out the line between 11" and 13", it is lighter and thinner even than the Air, has a re-engineered keyboard and somewhat controversially rolls many ports into just one: the USB-C standard port, which will handle HDMI video, external hard drives and other USB peripherals. Inevitably this is going to mean buying another set of cables.

The new Macbook Air with shiny retina screen.Kay Nietfeld/EPA

Watch my watch

In any other keynote this reveal would have been the main news item. But of course the main event was the watch. Seven months since Tim Cook first revealed the device, it’s been a long wait for more technical details. Opinion is still split on whether it will be a hard sell. With fewer people wearing watches anyway, the market is split between those who want a fitness tracker and those that want a beautiful luxury object. Is there a need for a device which essentially duplicates the functionality of a smartphone? Apple has to convince us that the watch offers more, in clear terms of where glancing at a watch is preferred to pulling out a phone.

Usually reserved to only one or two colours, this time Apple offers 20 different combinations of ways to customise the watch in size, colour, watch and strap material – probably a necessity in order to sell a device that by nature of being frequently visible is more fashion than function.

One watch to rule them (but in many colours).Martyn Landi/PA

The styling of the watch itself is reminiscent of the first iPhone, with three versions in two different sizes, 38mm or 42mm high: the cheapest Apple Sport at £299 with an aluminium body and plastic straps, the middle tier Apple Watch from £479 in stainless steel and wrist bands in leather, steel or plastic, and the gold Apple Watch Edition, which starts at £8,000 – perhaps more expensive even than the Apple Lisa from 1983, which sold at US$15,000 at the time. All the information, but smaller and nearer.Apple

Most of the functionality of the watch requires an iPhone within a few metres – maps, messages, Siri and other apps are relayed from the phone using WiFi or mobile data. Apple suggests that the battery will last 18 hours in a typical day.

Not first to market, but best?

Apple invests heavily in research and development to create new devices and interfaces that differentiate its products, at least, until competitors release their responses. Apple’s watch uses an Ion-X glass or Sapphire crystal screen which is pressure-sensitive to varying degrees. The side-mounted dial, which Apple terms a digital crown, enables scrolling and clicking, and a button below it jumps to frequent contacts. It has a “Taptic” engine which provides vibration feedback for certain apps, for example suggesting directions in Maps. The sensors on watch’s underside detect heartbeat and combine with the accelerometer to measure physical activity, something Apple is pitching as a major selling point.

Developers are already creating software that will extend their iPhone apps to interact with and be accessible from the watch, as Apple has with its Apple Pay contactless payment system. Miniature messages appear on the device in what Apple calls Glances, giving the impression of dealing with such messages quickly without the hassle of pulling out a phone.

From watches to smartwatches, with only a little relief.XKCD, CC BY-NC

Will it sell? In the past 18 months customers have bought 5m smartwatches or fitness bands, with Samsung flooding the market with many smartwatch devices, but with fitness bands accounting for the majority of sales. Current estimates suggest that Apple could sell more than 8m watches, eight times as many as its largest competitor.

While many of its features will appear in competitor’s smartwatches in the subsequent years, for the moment the eponymous watch is best in class. To sound a note of caution: like the first generation iPhone, the second generation device will probably be half as deep and run twice as long. You may be unfazed about the risks of being an early adopter, but if the idea of paying another few hundred pounds for the latest model next year isn’t appealing, it may be sensible to wait.

Barry Avery does not work for, consult to, own shares in or receive funding from any company or organisation that would benefit from this article, and has no relevant affiliations.