Update: Rendered images of the purported new Apple Watch 8 suggest no major design changes from Apple's upcoming smartwatch.

This year, the Apple Watch grew for the second time in its six-year history, with the Apple Watch 7 coming in 41mm and 45mm sizes, a significant size increase from the original Apple Watch, which boasted 38mm and 42mm.

However, display analyst Ross Young has a reasonable track record when it comes to Apple's predictions and doesn't expect to wait long for the next size change." Want to see a larger display on the Apple Watch Series 8 in 2022?" he asked his followers on Twitter.

If there were no follow-up tweets, it would sound like idle speculation: "Don't be surprised if there are three sizes next year," he wrote.

The recent increase in size of the Apple Watch 7 was done without the extra footprint due to the reduced bezel, but Apple doesn't have that many frames to remove, so we may see a physically larger device next time around.

It may be masked by the bold new square design that was hotly suggested for this year's model by many leakers but was not on show after all. Some claim that this information is reliable, which may be correct, but it means that the Apple Watch 8 was prepared for the Apple Watch 8 instead.

After the relatively modest upgrades made to the Apple Watch 7, such as brighter displays and shorter charging times, the Apple Watch 8 could be the biggest change in years, especially with regard to the health tracking sensor. Alongside the long-rumored blood glucose measurement (reports of which date back to 2017), the company is said to be working with Rockley Photonics, which produces non-invasive sensors that measure everything from blood pressure to alcohol levels.

Notably, the company's CEO told The Telegraph that he expects the company's technology to debut in consumer products next year, and hopes to see early results with the Apple Watch 8.

Tracking blood glucose levels will be interesting for those seeking to eat better and lose weight, but could be a game changer for diabetics who currently have to pay a premium for wearables and compatible medical hardware. As our senior writer Kate Kozuch reported last November, something like Dexcom would cost diabetics $245 for a transmitter and $1,035 for a three-month supply of disposable sensors.

All of this is, of course, a long way off, with the Apple Watch 7 only launching this Friday. If we take a cue from the past, the Apple Watch 8 will not be available until September 2022 at the earliest.