https://www.techradar.com/news/next-apple-watch-tipped-to-have-solid-state-buttons-and-advanced-health-tracking

We're expecting the Apple Watch Series 4 to launch in the not-too-distant future, and fresh reports suggest it's going to feature both solid-state buttons with haptic feedback, and an advanced set of health monitoring sensors that will be able to track more data than before.

This is as per a report in Fast Company citing "a source with direct knowledge" of what Apple has got up its sleeve – or rather is wanting to put up yours. As yet we don't have any official confirmation from Apple about its next wearable, but this does chime in with previous rumors we've heard about the device.