Samsung has yet to confirm its next lineup of smartwatches and fitness trackers this year, although rumors are rife that the company will unveil the Gear S4 next.

A listing for an unnamed Samsung smartwear device, which appears to be the next entry in Samsung's Gear S series, was recently spotted online. The supposed Samsung Gear S4 is expected to boast improved health and fitness features, particularly for sleep tracking.

Interestingly, other reports suggest that the Gear S4 will include a blood pressure reader as well.

The public waited for Samsung to announce the Gear S3 throughout last year, thinking that the launch of a new Gear S smartwatch was already overdue. However, the company unveiled the new Gear Sport instead, which is a different kind of fitness tracker from the Gear S.

This year, it is expected that the Samsung Gear S4 will finally be revealed, as evidenced by a product listing obtained by Sam Mobile. It appears that Samsung has already been working on the Gear S4 for quite some time, and now a new smartwatch with model number SM-R800 is on its way to the market.

Per Tech Radar, this upcoming Samsung smartwear might actually be the Gear S4, based on the model number that this particular device is using. Some people doubt if the new tech is actually a Gear S smartwear, or just a next-generation Gear Sport. Although, its model number seems to follow that of the Samsung Gear S3 Classic and Frontier editions, which come with the numbers SM-R770 and SM-R760, respectively. Meanwhile, the 2016 Samsung Gear Sport uses the model number SM-R600.

The listing further reveals that the Samsung Gear S4 will be packed with more improved health and fitness features. The highlight of the upcoming smartwatch could be a more in-depth sleep tracking technology. There are no details provided regarding the Gear S4's new sports activity tracking, although a separate report shows that the device will get a vital health monitoring feature. A recent patent leak has the new Samsung Gear S4 with a blood pressure reader. This kind of feature is quite hard to incorporate to a small wearable tech like the Samsung Gear S, so the patent suggests a special non-invasive method of measuring the blood pressure without having to add huge and heavy components to the smartwatch.

Other possible features of the Samsung Gear S4 include a bigger RAM capacity and longer battery life. In terms of the release date, it is likely that Samsung will make the announcement along with another high-end device, the Galaxy Note 9, this August.