While not as ground-breaking as Wear OS 3, expect some subtle breakthroughs for Pixel Watch 2 and Galaxy Watch 6.
Samsung Wallet, Thermo Check and WhatsApp Are Coming to Galaxy Watch Series – Samsung Mobile Press
SAMSUNG Galaxy Watch 5 40mm LTE Smartwatch w/Body, Health, Fitness and Sleep Tracker, Improved Battery, Sapphire Crystal Glass, Enhanced GPS Tracking, US Version, Gray : Electronics
IMPORTANT - Galaxy Watch 4/5 UPDATE (One Ui 5 & Wear Os 4 Release Date)
Google Wear OS 4: Features, release date, and more - Android Authority
Samsung One UI 5 Watch Update Based on Google Wear OS 4 Announced For Eligible Galaxy Watches
Wear OS 4-based One UI Watch 5 update is powered by Android 13 - SamMobile
One UI Watch4.5 Brings a Complete Watch Experience With Added Convenience and Accessibility Features – Samsung Global Newsroom
One UI Watch4.5 Brings a Complete Watch Experience with Added Convenience and Accessibility Features – Samsung Mobile Press
State of Google Wear OS 4: List of compatible smartwatches
