Google has so far confirmed that only a handful of current and upcoming smartwatches will be upgradeable to Wear OS 3 later this year.
Wear OS 3 will work with iPhone after all - 9to5Google
Meet Material You: New feature of Google Wear OS 4 - gHacks Tech News
Google Home app on Wear OS 3
WhatsApp beta is now available for Google Wear OS smartwatches - Neowin
Google Pixel Watch 3 Month Review - James A. Chambers
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New Wear OS 3 screenshots give sneak peek of what's to come » YugaTech
Wear OS 3.0 updates explained!
Xiaomi could soon launch a Wear OS 3 smartwatch - Android Authority